I have a methodology question/recommendation for future videos. the traffic test map has 8 incoming highways. For a four-directional system interchange splitting them 2-2-2-2 seems reasonable, but for a service interchange I feel 3-3-1-1 might be a more realistic split. If the dogbone is struggling with through-traffic here, that's bcs it wasn't designed to handle as much in that direction. Personally, I love the "single bypass", or as I like to call it, the two-level roundabout. Mostly because it can be an extremely compact service interchange, which is easy to build and doesn't require me to set up traffic lights.
This kind of dumbbell interchange is one of the most common service interchanges I've seen off of highways in my region of Brazil. I've seen a few dogbones in urban areas, I think. The exits and entrance lanes are squished close to the highway to save on land area, though. The other most common type (besides "eyes" where you have to cross a side of the highway to get to the other and is only used for very low demand, like ranches and small villages) is the cloverleaf. Brazil has tons of area, so we make tons of cloverleafs.
6:15 roundabouts are usually not meant to take that much, It's savable with slip lanes, but that beating dead horse. 7:00 love it. I would still do it with 6 lane as well, but this looks great. Roundabout just for left turns or U turns.
If anything, I feel this shows how shoddy the vanilla traffic AI is. Cars are waiting unrealistically long to enter the roundabout. (Just pick a random car and watch it sit there for ages) Also the roads tying into the roundabout should have a more sweeping angle on the outer lanes, for smoother entry.
Also in the bypass roundabout interchange there were a lot of cars that would use the roundabout to keep going straight in the highway direction instead of just staying on the highway.
If traffic lights in-game needed electricity to function (so could fail if in blackouts), we'd probably see more reason to make intersections using roundabouts.
@@KaiHenningsen This is the key thing that's missing in C:S, the big, BIG, advantage that roundabouts have over other intersections is that they are so much safer.
@@KaiHenningsen Accidents should've been a thing in the game since release. I don't understand why cars simply clip through each other, cars can't clip through each other in real life.
I've been building a norway inspired city on one of the snow maps and saw the double-bypass roudabout used in oslo so I reproduced it yesterday, and now it's in one of your videos. I was proud that your previous interchange tutorials helped me understand the mechanics and design this one on my own, though!
Impressive video as always, loved the parclo-roundabout. Here in the South UK (which is really heavily congested, and very limited on space) nearly all of our traditional roundabouts now have traffic lights! Although that sounds bizarre, it works very well. Roundabouts work well up to medium throughput, but is always bad on unbalanced intersections, and yielding eats up time. Lights have the advantage of no yielding, but multiple directions create long wait times. By merging the two, you have a single direction of travel, no yielding, and control of unbalanced intersections. From some directions you may get a double stop, before and on the roundabout, but usually (on the heaviest route) you can sail through. Love the channel , keep up the good work.
I thought it funny when you suggested making the roundabout "unrealistic but functional" by adding a 4th lane. There's a fair few around here with 4+ lanes, most not even on the motorways! The M40/A404 roundabout splits in half and comes back together, giving it effectively 5+4 functional lanes, with the motorway still bypassing it underneath. If it's complex but works, it probably does exist somewhere in Europe!
The Parclo-Double Roundabout has become sort of a theme in a lot of German smaller cities where Autobahn intersections need to work around existing roads to optimize traffic flow. Add a couple roundabout bypasses for straight across connections and you eliminate the need for a multi-lane roundabout. My city built one like those for their central highway intersection and it works flawless.
This is such an awesome channel, I'm so glad I found it. Literally answering all the niche questions I have in City Skylines which I try to find answers for online but can't. I've poured 400 hours into the game, but there's still so much stuff I don't know. Keep up the work man.
If you need suggestions for other channels you might want to check out. Overcharged Egg - He also does some nice tutorials ua-cam.com/users/OVERCHARGEDEGG Czardus - Also has tutorials amongst his videos ua-cam.com/users/Czardus Cityplanner Plays (CPP) - He is doing a long series for vanilla on how to dow stuff ua-cam.com/users/CityPlannerPlays Imperatur - For me he is the one who gives me the most inspiration for how to build different stuff ua-cam.com/users/imperatur KingLeno - Not that active in videos, but he has some really nice assets on steam ua-cam.com/users/KingLeno Lee Hawkins - Has some nice videos where he talks about how some of the mechanics works ua-cam.com/users/LeeHawkinsPhoto Biffa Plays - Has some nice videos where he builds cities and some videos on different stuff, he really likes round-a-bouts 😋 ua-cam.com/users/BiffaPlaysIndie And do enjoy the game, it can give you alot of entertainment but also make you grow a couple of grey hairs when eventually the traffic collapses 😁
@@bazzakrak Wow thanks so much this is awesome! Yeah traffic is just my main issue. My cities aren't obviously badly designed so I always feel like it's the placement of my services or my choice in intersections. Hence why I love this channel for its niche answers. Thanks for the suggestions I'll totally check them out.
Just wanted to pop back in Jacka SW I mentioned Imperatur and he has a video here that for me showcases how he thinks/works. ❤ He uses anarchy a good deal in his modded cities and in this video shows off the idea of placing buildings on top of other buildings to get different astethics (most likely misspelled, sorry) And that video is one of the main reasons I recommend him for ideas on how to plop down buildings and other things. Not to take anything away from YUMBLv who does an excellent work as well, and I think he will be fine with me praising another creator like ths 😎 PS - Edit It is Imperaturs video called: Setting Up Downtown with Mixed-Used Zoning :O | Cities: Skylines
I think the dog bone/ dumbbell option is the perfect solution for low-ish density areas IRL - we have both dumbbell and simple traffic light ones in my area, roundabouts are just nicer to use from a drivers perspective but once the traffic starts to ramp up they can't handle the traffic at all it's simply annoying to wait on a red traffic light in the middle of the night or speeding up / slowing down to try and catch the green phase in general
The majority of highway junctions in South east Qld, Australia are dumbbell style. Of course once space becomes limited it's traffic lights. But as someone whose spent their whole life here, I was surprised to see that's not really the majority. I think I first worked that out when searching for pre built interchanges on the workshop and being completely baffled by all of them.
This is basically a French interchanges episode (except for the crazy 3 level one) we love our roundabouts at any intersection so highways are no exception, we use dog bones and dumbells to dump people off highways or busy boulevards onto secondaries wherever we don't have the space for a parclo
I would have been interested to see the final lane assignment in TMPE for each of these. Not long but a few seconds to discuss how you optimised it. However another excellent video. You sir are right up there as one of my favourite UA-cam presenters.
Downloaded the map to practice building and using some of my own ideas and testing them out. Knowing why something fails is often as important as knowing why something works! Love your videos!
A real life example of double bypass roundabout is junction of M25 and A13 to the east of London leading to the Dartford crossing, I drive over it very often
The issue with the Bypass Roundabout seems to be that you have three lanes aproaching from the top and bottom, and yet almost all the "straight ahead" traffic is using the middle lane. The left lane is almost entirely empty, despite the fact that traffic could be using it to go straight ahead. The left lane on the roundabout itself underneath the bridges is similarly empty. The "minor" roads approaching the roundabout might as well be two-lanes on each side, and still carry the same traffic. Never played the game (forgive me, but YT algorithm sent me here...), so I don't know whether it's down to the setup or just the in-game's traffic modelling algorithm.
Heh, I've driven through that junction loads of times but never really noticed it because the bypass is so effective. I'm always impressed by the volume of traffic that the junction at Hangar Lane can handle though.
There used to be a bypass roundabout at QC-148 and A-640 in St.-Eustache, Québec, but MTQ took it out and it's now a more conventional diamond with a large gap between the north and southbound lanes of QC-148.
Very common to see dogbone/dumbbell interchanges in the Netherlands as well. It's mostly used when traffic is very biased towards one side of the interchange (for example a small city on one side, rural area on the other) and a bias towards one direction on the main road (for example commuting to a larger city nearby). With almost no cars flowing through this as an overpass or coming in from the other side of the main road it's a very small/cost-effective way to connect all directions. When I encounter these it's very rare that another car is coming in and I have to give way. The dumbbell part is on the side of the city, often combined with a carpool, or just to allow people to make a u-turn without going through the entire thing. You could give it the partial cloverleaf treatment and have one exit for both entry/exit lanes. That is commonly done here in order to provide a way to connect a small industrial or carpooling area as close to the highway as possible, instead of two sides to enter the roundabout.
Well, yumbl has been infected by roundabouts. Nothing can be done. He is lost now. My dad got a nasty roundabout infection when I was a kid. It was heartbreaking to watch him fade away.
The roundabout debate carries on.... like a roundabout... with no exit. These kind of roundabouts are quite common in the UK for motorway junctions. Or they have a very oval shape instead. But helps too when we don't have a billion cars per person all heading to the city centre down a 5 lane highway :P
One thing hurting your Bypass Roundabout is that some of the left-right highway traffic is using the roundabout to continue on the highway (car followed by truck at about 6:28 do this from left to right). Not sure how much of an actual impact it's having, but it's definitely not helping!
We have one of those diamond-dumbell interchanges in our city. It works fairly well, but only because the two highways it serves aren't overly congested.
There’s at least one dog bone interchange right where I live on the East Coast of the US, and is definitely a pretty low traffic interchange. It’s on a small, regional county highway and connects to some local arterial roads that have very little development. Mostly semi-rural and light industrial/commercial.
I know there's this dumbbell /dogbone interchange on the outskirts of my city Opole, Poland; it looks kinda funky, was difficult to get used to, but all in all it works as it should.
These were my starter highway exits when I started building my own interchanges. The first two are easy to build and work in vanilla. I built a very similar double bypass roundabout in a vanilla build some time ago. I expected problems with it but it pretty much ended up being the least problematic interchange in that build. Part of that was I also wanted it to be an exit but it was a little too much so they had to exit somewhere else.
We had an interchange like this IRL near where I used to live. Worked great, at a relatively lightly used highway interchange (mostly neighborhood residential traffic).
In Trinidad, the Debe interchange is amazing. It works well, very simple and it is also useful in case if you just use the interchange to turn around and go back north again.
You make some of the cleanest intersections and interchanges around. I would love to see your methods and talent applied to the pinavia and ITL interchanges.
hey, im not sure if it would have another name, but here in Norway a variant of the Dogbone is outside my city, ofcourse our traffic isnt massive or anything, but the way its different is the conncections are kind of Trumpet esc, the on, and off are essentially on the same connection to the roundabout meaning people going onto the highway block the roundabout for people passing under meaning people coming off get time to enter the roundabout etc. rarely backed up edit: yes essentially the roundabout parclo (parclo is common here tbh) but all on one side of the roundabout, not any split like in the video
My choice of intersection is usually the double Bybass roundabout or something similar. The partial is way better. Going to start using that. One thing on the partial, I noticed on the roundabouts you have 2 lanes merge into one slip lane for entering the motorway, any reason for that over just one?
Honestly, i would give it another try with proper lane math, by that i mean, each entry to the interchange wants one of three things: go right, go straight, go left. Pretty much same logic as the number of lanes in a turbo roundabout should be the amount of exits minus one cause you shouldnt use a main system interchange to do a u turn. So i think there's a lot of optimization to be done in this reward with all the interchanges you've made, and i would like a video trying this out. Also, just as another idea worth testing, i would use the overpass in the parclo roundabout to merge the left turns from the highway with the traffic from the avenue instead of using the roundabout to do it, might make it a bit better and a bit 'safer' so assimetric 3-2 overpass with 3 lanes entering from the roundabout and 2 trying to enter each roundabout.
@@YUMBL Yeah, i just meant that the unification (if that's a word) of the turning left from highway with the straight through from the avenue would look cooler if it was done on the bridge instead of on the roundabout, my reasoning is that drivers are better at 'zipping' 2 lanes when they are parallel than when its on a roundabout, personal expirience, some people suck at incorporating themselves onto roundabaouts and need 2, 3 or even 4 car slots to merge in, while most people on parallel merging need 1-2 car slots. Of course in CS cars, especially trucks seem to only need 0.1 slot to zipp in since the basic rule of physics that two different objects cannot occupy the same place at the same time doesnt seem to be hold to decent standards XD In any case, i guess i was a bit confused and didnt get the 2 lane throughtput that you were going for on the avenue, but then imo the avenue needs to be 4 lanes, so you have 2 throughput 1 left and 1 right. I'm not sure of anything to be honest, by my intuition is telling me there's something i would do different with these intersections and it doesnt seem to me that it has reached perfection, dont know why. But yeah, i can see now what you were going for and i understand it better, its not what i thought was happening, so my bad. Fun fact, the roundabout in the system interchange (double bypass) is only for turning left, so you could make it go clockwise for funsies, also with some extensive use of intersection marking tool and cutting 'corners' nicely i think you could end up with a new flower interchange. Looking more into it, correct me if im wrong, but it would also make it a tiny bit more efficient, since traffic going counter clockwise has to 'put up' with 2 other lanes entering, but going clockwise they only have to put up with 1, if im not missing something.
The last one is really common in France except that it usually only has the loop (and is usually the roundabout full circle variant) and not the ramp coming straight off into the roundabouts.
This might be a fun one for you. You should look it up. The I-10 in El Paso, TX runs parrallel to Loop 375. They kinda intersect each other via Executive blvd. I wish that they would have made a better interchange in this area as the current design seems a bit basic and perhaps confusing to some. Someone already went nto the off ramp crashing onto oncoming trafic. Check it out. Here are the coordinates 31°47'31.70"N 106°31'15.65"W
Want circles? We got circles for days. Come to Circle Highways where you can customize your circle highway. We got left circles, right circles, circles above, circles below, large circles, small circles, and even circles in circles.
I don't know if you ever noticed or if anyone pointed it out, but the reason the single bypass failed so hard was because the on-ramps and the roundabout had the same speed limit as the bypass. You can see that cars are lining up on the on-ramp only to get right off and back to the highway they left. Since we know pathing is based on the fastest route, I don't think the cims are being deterred from using the roundabout to make the wiser choice of staying on the bypass.
Where I live we have a something very very similar to what you did with the double-bypass roundabout including slip-lanes, underpass and overpass. The only difference is that the overpass is for one direction only (in our specific case it's the correct decision I think). Oh and being in an urban area we also have a pedestrian "underpass" on the ground level, what is your case is the highway it's set as an underpass which is under the pedestrian underpass which is under the roundabout which is under the overpass. Also the pedestrian underpass crossing connects up to the roundabout between the roundabout itself and the slip-lanes, the reasong being that there are bus stops IN the roundabout, which is not really good in my opinion and would be the major thing I'd change.
The double-bypass roundabout is sometimes called a "vollyball interchange". So called because like two volleyball players with the ball falling between them, neither of the main routes actually takes care of the interchanging of vehicles from one route the the other.
Just came across this video. Very nice but one observation for the circle under the highway interchange: the majority of traffic is coming out of the highway and going into the circle to make turns. I believe it may be a setup issue but if the heavier traffic is north south then the lifted highway would be in that direction rather than left-right direction.
Hahaha I just watched a previous video and said "where's the slip lane" and u literally said that in this video... I'm glad you're self aware of it all
Just left Roundabout city after being stuck in a loop for 3 days. It’s so nice being in a different roundabout city that doesn’t have shit in their water. I love roundabouts BatChest
I have a dumbell in my city, and it always gets congestion, there is no fix for this, u have to introduce alternative routes in the middle of the road.
The Dog Bell can be improved by the addition of an additional, segregated, left turn only filter lanes. As to your final preferred solution, the planners of London's orbital motorway came to the same conclusion in the 1970's. A search for say "Aerial photograph of Junction 28 where M25 meets A12 by Brentwood", or "Aerial view Junction 30 M25", will reveal a 50 year old predecessor. There are live CCTV streams of the junctions, if you want some real world data.
Here’s a suggestion for Yumbl: How about making a variant of the dog-bone parclo at the end, with a couple of slight changes. 1. Get rid of the dog-bone. 2. The highway off ramps section splits into one going under the arterial and one going up. Where it goes up to the arterial, make it bi-directional as well. 3. Connect the newly bidirectional section to the section that goes under the overpass in a similar manner as the “parclo” loops connect to it. Prevent all left turns on/off the interchange and you have a fairly free flowing service interchange. (You may need to adjust the lane mathematics to optimize the flow rate.)
my state prefers dogbone, it's nice, and because the traffic is light it doesn't get backed up as much, sure the traffic here is light but in reality you are going to have traffic jams with even the most efficient means unless you have proper public transport to ease congestion.
Double By-pass Roundabout looks alot like a busy intersection in my area.. but remove right turn by-pass and add timed traffic lights on the 4 corners of the roundabout. "knooppunt rottepolderplein" i find it an annoying intersections where jams usually come from in my area. (don't know if there there often though as i don't go that way often.) but due to size constraints train rails on one side and industrial on the other it kinda makes sense. Edit: just looked up the intersection.. apparently its only 2/3's of the intersection.. the one below it with "Schipholweg" is also tecnically part of it.
I guess, for the RoPaC you've put lane connectors to make sure the the cars leaving HW at the first exit are only going right (slip). If those guys use the roundabout to make a 270° left turn, I'd expect this to fail... the fun of tweaking interchanges does not fade at all for me😁thanks for further inspiration
So, I have to ask as someone who's putting more custom props into his city. Is there a way to remove the preset highway gantries? They are annoying, clash with my custom gantries, and I've tried two prop removers that don't do anything with em.
I've seen how the full clover leaf without bypass can be problematic for throughput, but how does the full clover leaf with bypasses and slip lanes manage traffic? We see a lot of those in Europe and it would be interesting to see how well they work in game.
Hmm, regarding space taken up by the bypass roundabout intersections, I think if RL road geometries were followed then they're more efficient. I'm sure you know that the roundabout intersections are so common in the UK partly because of the space cloverleafs take up. I think that on motorways, weaving sections (like you have in the middle of a c-leaf) can't be shorter than 2km. The only c-leafs in the UK are on lower speed roads. In effect the slip roads give time for drivers to adjust to the lower speed on a roundabout, so weaving, sharp angles etc aren't a problem, but directly off a motorway, they are a problem.
On the Double By-pass Highway Roundabout, it looks like there's a nasty conflict point where the highway offramp meets the roundabout. I realize conflict points are impossible to eliminate altogether. I was imagining myself entering that roundabout at near highway speed, and crossing the traffic exiting the roundabout. You can even see some of the CIMS slamming on their brakes, lol. I like the design, though. I think that intersection/merge could use a tweak. edit: I just realized calling a Double By-pass is fitting, lol. Could induce heart-attacks.
@@YUMBL What do you have your 'follows the rules of the road' setting at? I swear I saw those drivers sailing thru that merge, oncoming traffics be damned. Maybe it's just normal functionality, but more obvious because there's only the one interchange to focus on. I just thought it was kinda funny.
All of these apart from the partial cloverleaf variety are common in the UK The other type that you haven't tried is the big wheel which is basically a huge roundabout spanning the highway (or going underneath) in 2 places which is super super common especially as service interchanges or where several medium roads meet a motorway in a more rural area... It especially works well when you have more than 2 feeder roads joining
With a double bypass, you can simply remove the roundabout and have a 2-phase signal intersection for left turn only. Depending on the traffic wanting to turn left, I think you can have 3 lanes intersection in a smaller footprint than a roundabout. That's what they did in my city
On the Partial Clover Leaf + Round-about, did you consider using a single lane off-ramp, and then pulling the exiting traffic off the continuing highway after the overpass?
stumbled across your channel due to the robots suggestions in part due to being subbed to Biffa after watching 2-3 videos i ended up subbing to you. and have binge watched alot of your content getting ideas on how to make my cities better. I think I know why the robots suggested you. you are the "Bob Ross" of Skylines. keep putting out the great content
I noticed on the bypass roundabout you had traffic exiting right to go thru the round about, exit right and rejoin the highway. I suspect it may be a speed limit thing, if you increase it on the over pass, traffic not wanting to exit will stay on.
They're building an AB2 parclo with roundabouts in Alberta currently, at the intersection of Highways 1A and 22. Google "Cochrane interchange". I'm curious how it would perform in your simulations. It's similar to your parclo at the end of the video, but without the slip lanes.
Well a dumbbell or dogbone is a service interchange. It's slightly better than a diamond, but I'd definitely not expect it to be able to handle all that much traffic. The interchange test map is definitely for system interchanges.
The bypass roundabouts serve the highways into my city zones just fine. It must be the heavy cross traffic that causes issues or just the public transit of my city
The real issue here is the number of interactions and number of cars flowing through. Straight thru bypasses are the most obvious way to lower the flow of traffic through the interchange to start with, which also offering the straight thru traffic the desirable "no slow down" route. The dogbone / dumbell could be significantly improved just by giving the north south a straight through option that would be faster than taking the traffic circles. That would lower the traffic in by a certain amount, and also significantly decrease the number of car to car interactions occuring.
I was hoping for sliplanes in the massive dogbone, but as someone stated a 2-2-2-2 split of the highways is probably not realistic for a dogbone and a 3-1-3-1 would be better as you'll expect a non even distribution of traffic and destinations. Maybe even a 3-2-2-1 as one end of the dogbone may be more popular, same with the highway.
Yumbl! I noticed some lane mathematics issues with the one at 9:50ish mark (before the partial cloverleaf. Some cars went Highway>Roundabout>Back to same Highway. Least so you know. Nice seeing the different ideas! 👌🏼 👍🏼
Just the nature of cars sharing lanes in the roundabout. It requires a three lane road to force cars to use a specific exit, but thats not realistic or necessary here imo. Two should be enough, but you cant force them to use the lanes you want.
Some time ago, i made a junction by trial and error with the same design of the double.bypass roundabout, but the roundabout instead of going anti-clockwise, it went clockwise
I have a methodology question/recommendation for future videos. the traffic test map has 8 incoming highways. For a four-directional system interchange splitting them 2-2-2-2 seems reasonable, but for a service interchange I feel 3-3-1-1 might be a more realistic split. If the dogbone is struggling with through-traffic here, that's bcs it wasn't designed to handle as much in that direction.
Personally, I love the "single bypass", or as I like to call it, the two-level roundabout. Mostly because it can be an extremely compact service interchange, which is easy to build and doesn't require me to set up traffic lights.
You're becoming more of an expert on roundabouts, intersections and traffic merging than most real life city planners today.
This kind of dumbbell interchange is one of the most common service interchanges I've seen off of highways in my region of Brazil. I've seen a few dogbones in urban areas, I think. The exits and entrance lanes are squished close to the highway to save on land area, though.
The other most common type (besides "eyes" where you have to cross a side of the highway to get to the other and is only used for very low demand, like ranches and small villages) is the cloverleaf. Brazil has tons of area, so we make tons of cloverleafs.
Same in the UK
I swear this GUY is becoming a LEGEND in Cities Skylines with all these videos. Thanks for the hard work.
6:15 roundabouts are usually not meant to take that much, It's savable with slip lanes, but that beating dead horse. 7:00 love it. I would still do it with 6 lane as well, but this looks great. Roundabout just for left turns or U turns.
If anything, I feel this shows how shoddy the vanilla traffic AI is. Cars are waiting unrealistically long to enter the roundabout. (Just pick a random car and watch it sit there for ages)
Also the roads tying into the roundabout should have a more sweeping angle on the outer lanes, for smoother entry.
Also in the bypass roundabout interchange there were a lot of cars that would use the roundabout to keep going straight in the highway direction instead of just staying on the highway.
The smoother the angle the worse the yield. It puts the line back further and makes the problem youre describing worse. Also less safe irl
@@YUMBL I'd never had thought! I'll take your word for it
Everything’s a balance. Makes the roundabout really tough at high density. I think this map is a fair stress test overall.
@@YUMBL And I thoroughly enjoyed it! Great nuanced take👍🏻
If traffic lights in-game needed electricity to function (so could fail if in blackouts), we'd probably see more reason to make intersections using roundabouts.
Also, if traffic accidents were a thing.
@@KaiHenningsen I have seen cars drive though others not sure how that happens.
@@KaiHenningsen This is the key thing that's missing in C:S, the big, BIG, advantage that roundabouts have over other intersections is that they are so much safer.
Traffic lights are only ever needed if roads aren't planned properly
@@KaiHenningsen Accidents should've been a thing in the game since release. I don't understand why cars simply clip through each other, cars can't clip through each other in real life.
I've been building a norway inspired city on one of the snow maps and saw the double-bypass roudabout used in oslo so I reproduced it yesterday, and now it's in one of your videos. I was proud that your previous interchange tutorials helped me understand the mechanics and design this one on my own, though!
Impressive video as always, loved the parclo-roundabout. Here in the South UK (which is really heavily congested, and very limited on space) nearly all of our traditional roundabouts now have traffic lights! Although that sounds bizarre, it works very well. Roundabouts work well up to medium throughput, but is always bad on unbalanced intersections, and yielding eats up time. Lights have the advantage of no yielding, but multiple directions create long wait times. By merging the two, you have a single direction of travel, no yielding, and control of unbalanced intersections. From some directions you may get a double stop, before and on the roundabout, but usually (on the heaviest route) you can sail through. Love the channel , keep up the good work.
It works well if the lights are set up and timed well
My local junction is definitely not
Roundabouts in this style are very common in Europe
I thought it funny when you suggested making the roundabout "unrealistic but functional" by adding a 4th lane. There's a fair few around here with 4+ lanes, most not even on the motorways!
The M40/A404 roundabout splits in half and comes back together, giving it effectively 5+4 functional lanes, with the motorway still bypassing it underneath.
If it's complex but works, it probably does exist somewhere in Europe!
I also thought it was funny, given that they are reasonably common coming in and out of cities in the UK
The Parclo-Double Roundabout has become sort of a theme in a lot of German smaller cities where Autobahn intersections need to work around existing roads to optimize traffic flow. Add a couple roundabout bypasses for straight across connections and you eliminate the need for a multi-lane roundabout. My city built one like those for their central highway intersection and it works flawless.
This is such an awesome channel, I'm so glad I found it. Literally answering all the niche questions I have in City Skylines which I try to find answers for online but can't. I've poured 400 hours into the game, but there's still so much stuff I don't know. Keep up the work man.
If you need suggestions for other channels you might want to check out.
Overcharged Egg - He also does some nice tutorials
ua-cam.com/users/OVERCHARGEDEGG
Czardus - Also has tutorials amongst his videos
ua-cam.com/users/Czardus
Cityplanner Plays (CPP) - He is doing a long series for vanilla on how to dow stuff
ua-cam.com/users/CityPlannerPlays
Imperatur - For me he is the one who gives me the most inspiration for how to build different stuff
ua-cam.com/users/imperatur
KingLeno - Not that active in videos, but he has some really nice assets on steam
ua-cam.com/users/KingLeno
Lee Hawkins - Has some nice videos where he talks about how some of the mechanics works
ua-cam.com/users/LeeHawkinsPhoto
Biffa Plays - Has some nice videos where he builds cities and some videos on different stuff, he really likes round-a-bouts 😋
ua-cam.com/users/BiffaPlaysIndie
And do enjoy the game, it can give you alot of entertainment but also make you grow a couple of grey hairs when eventually the traffic collapses 😁
@@bazzakrak Wow thanks so much this is awesome! Yeah traffic is just my main issue. My cities aren't obviously badly designed so I always feel like it's the placement of my services or my choice in intersections. Hence why I love this channel for its niche answers. Thanks for the suggestions I'll totally check them out.
Thanks a lot :)
Just wanted to pop back in Jacka SW
I mentioned Imperatur and he has a video here that for me showcases how he thinks/works. ❤
He uses anarchy a good deal in his modded cities and in this video shows off the idea of placing buildings on top of other buildings to get different astethics (most likely misspelled, sorry)
And that video is one of the main reasons I recommend him for ideas on how to plop down buildings and other things.
Not to take anything away from YUMBLv who does an excellent work as well, and I think he will be fine with me praising another creator like ths 😎
PS - Edit
It is Imperaturs video called:
Setting Up Downtown with Mixed-Used Zoning :O | Cities: Skylines
I think the dog bone/ dumbbell option is the perfect solution for low-ish density areas IRL - we have both dumbbell and simple traffic light ones in my area, roundabouts are just nicer to use from a drivers perspective but once the traffic starts to ramp up they can't handle the traffic at all
it's simply annoying to wait on a red traffic light in the middle of the night or speeding up / slowing down to try and catch the green phase in general
The majority of highway junctions in South east Qld, Australia are dumbbell style. Of course once space becomes limited it's traffic lights. But as someone whose spent their whole life here, I was surprised to see that's not really the majority. I think I first worked that out when searching for pre built interchanges on the workshop and being completely baffled by all of them.
This is basically a French interchanges episode (except for the crazy 3 level one) we love our roundabouts at any intersection so highways are no exception, we use dog bones and dumbells to dump people off highways or busy boulevards onto secondaries wherever we don't have the space for a parclo
I would have been interested to see the final lane assignment in TMPE for each of these. Not long but a few seconds to discuss how you optimised it.
However another excellent video. You sir are right up there as one of my favourite UA-cam presenters.
Thank you very much :)
This video is just a welcome to every service interchange in the UK.the only other common one not in this is trumpet into a roundabout.
Downloaded the map to practice building and using some of my own ideas and testing them out. Knowing why something fails is often as important as knowing why something works! Love your videos!
A real life example of double bypass roundabout is junction of M25 and A13 to the east of London leading to the Dartford crossing, I drive over it very often
The issue with the Bypass Roundabout seems to be that you have three lanes aproaching from the top and bottom, and yet almost all the "straight ahead" traffic is using the middle lane. The left lane is almost entirely empty, despite the fact that traffic could be using it to go straight ahead. The left lane on the roundabout itself underneath the bridges is similarly empty. The "minor" roads approaching the roundabout might as well be two-lanes on each side, and still carry the same traffic.
Never played the game (forgive me, but YT algorithm sent me here...), so I don't know whether it's down to the setup or just the in-game's traffic modelling algorithm.
The Double-Bypass Roundabout is known to all North Londoners as "Where The North Circular Hits the A41"
Wisley interchange (A3/M25) junction is a double bypass as well
@@qooqle A1M/M18 too
Tonnes of these roundabout interchanges in UK
Heh, I've driven through that junction loads of times but never really noticed it because the bypass is so effective. I'm always impressed by the volume of traffic that the junction at Hangar Lane can handle though.
Love this series. Building interchanges is one of my favorite things and there are some great ideas here.
There used to be a bypass roundabout at QC-148 and A-640 in St.-Eustache, Québec, but MTQ took it out and it's now a more conventional diamond with a large gap between the north and southbound lanes of QC-148.
Did they find it didn't work or they don't like roundabouts?
@@pbilk That I don’t know.
Very common to see dogbone/dumbbell interchanges in the Netherlands as well. It's mostly used when traffic is very biased towards one side of the interchange (for example a small city on one side, rural area on the other) and a bias towards one direction on the main road (for example commuting to a larger city nearby). With almost no cars flowing through this as an overpass or coming in from the other side of the main road it's a very small/cost-effective way to connect all directions. When I encounter these it's very rare that another car is coming in and I have to give way. The dumbbell part is on the side of the city, often combined with a carpool, or just to allow people to make a u-turn without going through the entire thing.
You could give it the partial cloverleaf treatment and have one exit for both entry/exit lanes. That is commonly done here in order to provide a way to connect a small industrial or carpooling area as close to the highway as possible, instead of two sides to enter the roundabout.
Well, yumbl has been infected by roundabouts. Nothing can be done. He is lost now.
My dad got a nasty roundabout infection when I was a kid. It was heartbreaking to watch him fade away.
And a bad case of ring road too
The roundabout debate carries on.... like a roundabout... with no exit. These kind of roundabouts are quite common in the UK for motorway junctions. Or they have a very oval shape instead. But helps too when we don't have a billion cars per person all heading to the city centre down a 5 lane highway :P
One thing hurting your Bypass Roundabout is that some of the left-right highway traffic is using the roundabout to continue on the highway (car followed by truck at about 6:28 do this from left to right). Not sure how much of an actual impact it's having, but it's definitely not helping!
Its an issue inherent to the roundabout it seems
We have one of those diamond-dumbell interchanges in our city. It works fairly well, but only because the two highways it serves aren't overly congested.
There’s at least one dog bone interchange right where I live on the East Coast of the US, and is definitely a pretty low traffic interchange. It’s on a small, regional county highway and connects to some local arterial roads that have very little development. Mostly semi-rural and light industrial/commercial.
"Fix the dog bone. I'm all ears." I see what you did there! 😆
I know there's this dumbbell /dogbone interchange on the outskirts of my city Opole, Poland; it looks kinda funky, was difficult to get used to, but all in all it works as it should.
These were my starter highway exits when I started building my own interchanges. The first two are easy to build and work in vanilla. I built a very similar double bypass roundabout in a vanilla build some time ago. I expected problems with it but it pretty much ended up being the least problematic interchange in that build. Part of that was I also wanted it to be an exit but it was a little too much so they had to exit somewhere else.
We had an interchange like this IRL near where I used to live. Worked great, at a relatively lightly used highway interchange (mostly neighborhood residential traffic).
Double bypass roundabout is common here in Norway, one of my favorites to use in my cities
In Trinidad, the Debe interchange is amazing. It works well, very simple and it is also useful in case if you just use the interchange to turn around and go back north again.
I think the only one of these I've encountered in real life was the dogbone, used on a small road crossing US-101 in Arcata, CA.
You make some of the cleanest intersections and interchanges around. I would love to see your methods and talent applied to the pinavia and ITL interchanges.
Sippa tea, please!
We have these all over Perth Australia. They work very well.
I'd call it the 'Dog Parc'
hey, im not sure if it would have another name, but here in Norway a variant of the Dogbone is outside my city, ofcourse our traffic isnt massive or anything, but the way its different is the conncections are kind of Trumpet esc, the on, and off are essentially on the same connection to the roundabout meaning people going onto the highway block the roundabout for people passing under meaning people coming off get time to enter the roundabout etc. rarely backed up
edit: yes essentially the roundabout parclo (parclo is common here tbh) but all on one side of the roundabout, not any split like in the video
My choice of intersection is usually the double Bybass roundabout or something similar. The partial is way better. Going to start using that. One thing on the partial, I noticed on the roundabouts you have 2 lanes merge into one slip lane for entering the motorway, any reason for that over just one?
Its so two lanes of through traffic can make it across on the arterial.
Honestly, i would give it another try with proper lane math, by that i mean, each entry to the interchange wants one of three things: go right, go straight, go left. Pretty much same logic as the number of lanes in a turbo roundabout should be the amount of exits minus one cause you shouldnt use a main system interchange to do a u turn. So i think there's a lot of optimization to be done in this reward with all the interchanges you've made, and i would like a video trying this out. Also, just as another idea worth testing, i would use the overpass in the parclo roundabout to merge the left turns from the highway with the traffic from the avenue instead of using the roundabout to do it, might make it a bit better and a bit 'safer' so assimetric 3-2 overpass with 3 lanes entering from the roundabout and 2 trying to enter each roundabout.
The through traffic (center) lane stacks up.
@@YUMBL Yeah, i just meant that the unification (if that's a word) of the turning left from highway with the straight through from the avenue would look cooler if it was done on the bridge instead of on the roundabout, my reasoning is that drivers are better at 'zipping' 2 lanes when they are parallel than when its on a roundabout, personal expirience, some people suck at incorporating themselves onto roundabaouts and need 2, 3 or even 4 car slots to merge in, while most people on parallel merging need 1-2 car slots. Of course in CS cars, especially trucks seem to only need 0.1 slot to zipp in since the basic rule of physics that two different objects cannot occupy the same place at the same time doesnt seem to be hold to decent standards XD
In any case, i guess i was a bit confused and didnt get the 2 lane throughtput that you were going for on the avenue, but then imo the avenue needs to be 4 lanes, so you have 2 throughput 1 left and 1 right. I'm not sure of anything to be honest, by my intuition is telling me there's something i would do different with these intersections and it doesnt seem to me that it has reached perfection, dont know why. But yeah, i can see now what you were going for and i understand it better, its not what i thought was happening, so my bad.
Fun fact, the roundabout in the system interchange (double bypass) is only for turning left, so you could make it go clockwise for funsies, also with some extensive use of intersection marking tool and cutting 'corners' nicely i think you could end up with a new flower interchange. Looking more into it, correct me if im wrong, but it would also make it a tiny bit more efficient, since traffic going counter clockwise has to 'put up' with 2 other lanes entering, but going clockwise they only have to put up with 1, if im not missing something.
The last one is really common in France except that it usually only has the loop (and is usually the roundabout full circle variant) and not the ramp coming straight off into the roundabouts.
Suddenly Biffa appears:
This might be a fun one for you. You should look it up. The I-10 in El Paso, TX runs parrallel to Loop 375. They kinda intersect each other via Executive blvd. I wish that they would have made a better interchange in this area as the current design seems a bit basic and perhaps confusing to some. Someone already went nto the off ramp crashing onto oncoming trafic. Check it out. Here are the coordinates 31°47'31.70"N 106°31'15.65"W
Want circles? We got circles for days. Come to Circle Highways where you can customize your circle highway. We got left circles, right circles, circles above, circles below, large circles, small circles, and even circles in circles.
i see you've never been to England, we have things similar to those Dogbone/Dumbell crossings everywhere on motorways where they join to an A road
With proportionate traffic density I assume.
@@YUMBL Not always!
Uh oh 😂
I don't know if you ever noticed or if anyone pointed it out, but the reason the single bypass failed so hard was because the on-ramps and the roundabout had the same speed limit as the bypass. You can see that cars are lining up on the on-ramp only to get right off and back to the highway they left. Since we know pathing is based on the fastest route, I don't think the cims are being deterred from using the roundabout to make the wiser choice of staying on the bypass.
"Circles?! In my interchange?! Its more likely than you think"
😂
can you try to make a continuous flow intersection into a interchange?
I hope you one day you re create that video which has over 10M views, that shows all the different interchanges with increasing traffic capacity
Where I live we have a something very very similar to what you did with the double-bypass roundabout including slip-lanes, underpass and overpass. The only difference is that the overpass is for one direction only (in our specific case it's the correct decision I think). Oh and being in an urban area we also have a pedestrian "underpass" on the ground level, what is your case is the highway it's set as an underpass which is under the pedestrian underpass which is under the roundabout which is under the overpass. Also the pedestrian underpass crossing connects up to the roundabout between the roundabout itself and the slip-lanes, the reasong being that there are bus stops IN the roundabout, which is not really good in my opinion and would be the major thing I'd change.
The double-bypass roundabout is sometimes called a "vollyball interchange". So called because like two volleyball players with the ball falling between them, neither of the main routes actually takes care of the interchanging of vehicles from one route the the other.
Just came across this video. Very nice but one observation for the circle under the highway interchange: the majority of traffic is coming out of the highway and going into the circle to make turns. I believe it may be a setup issue but if the heavier traffic is north south then the lifted highway would be in that direction rather than left-right direction.
Hahaha I just watched a previous video and said "where's the slip lane" and u literally said that in this video... I'm glad you're self aware of it all
Just left Roundabout city after being stuck in a loop for 3 days. It’s so nice being in a different roundabout city that doesn’t have shit in their water. I love roundabouts BatChest
I have a dumbell in my city, and it always gets congestion, there is no fix for this, u have to introduce alternative routes in the middle of the road.
nice one, this type is very popular in poland
4:18 if you allow the rightmost lane to go straight, will it help?
The Dog Bell can be improved by the addition of an additional, segregated, left turn only filter lanes. As to your final preferred solution, the planners of London's orbital motorway came to the same conclusion in the 1970's. A search for say "Aerial photograph of Junction 28 where M25 meets A12 by Brentwood", or "Aerial view Junction 30 M25", will reveal a 50 year old predecessor. There are live CCTV streams of the junctions, if you want some real world data.
Here’s a suggestion for Yumbl: How about making a variant of the dog-bone parclo at the end, with a couple of slight changes.
1. Get rid of the dog-bone.
2. The highway off ramps section splits into one going under the arterial and one going up. Where it goes up to the arterial, make it bi-directional as well.
3. Connect the newly bidirectional section to the section that goes under the overpass in a similar manner as the “parclo” loops connect to it.
Prevent all left turns on/off the interchange and you have a fairly free flowing service interchange. (You may need to adjust the lane mathematics to optimize the flow rate.)
Id have to see it to understand
So what you're saying is, roundabouts are superior? Interesting. I'll let Biffa know. 😎
Nothing of the sort ;)
@@YUMBL - And so the CS civil war rages on. 🤣
9:49 why do you need roundabouts when the ends aren't used (just semi-clover/2 opposites end of clover will do).
I generally allow u-turns when I put in a round-a-bout, that's the safest, least disruptive option in real life.
my state prefers dogbone, it's nice, and because the traffic is light it doesn't get backed up as much, sure the traffic here is light but in reality you are going to have traffic jams with even the most efficient means unless you have proper public transport to ease congestion.
Double By-pass Roundabout looks alot like a busy intersection in my area.. but remove right turn by-pass and add timed traffic lights on the 4 corners of the roundabout.
"knooppunt rottepolderplein" i find it an annoying intersections where jams usually come from in my area. (don't know if there there often though as i don't go that way often.) but due to size constraints train rails on one side and industrial on the other it kinda makes sense.
Edit: just looked up the intersection.. apparently its only 2/3's of the intersection.. the one below it with "Schipholweg" is also tecnically part of it.
I guess, for the RoPaC you've put lane connectors to make sure the the cars leaving HW at the first exit are only going right (slip). If those guys use the roundabout to make a 270° left turn, I'd expect this to fail...
the fun of tweaking interchanges does not fade at all for me😁thanks for further inspiration
Correct! They must exit
Yumbl: my favorite traffic engineer
Thank you :)
So, I have to ask as someone who's putting more custom props into his city. Is there a way to remove the preset highway gantries? They are annoying, clash with my custom gantries, and I've tried two prop removers that don't do anything with em.
Are gantries pillars? Most things should be changeable with either “BoB” or “Network Skins”
I've seen how the full clover leaf without bypass can be problematic for throughput, but how does the full clover leaf with bypasses and slip lanes manage traffic? We see a lot of those in Europe and it would be interesting to see how well they work in game.
I have done some "compact" version of your parclo and I've added round abouts in the 2.0 version recently ahahahah we had the same idea that's great
Could you show the lane settings in TMPE for the Roundabout Partial Cloverleaf, please?
Hmm, regarding space taken up by the bypass roundabout intersections, I think if RL road geometries were followed then they're more efficient. I'm sure you know that the roundabout intersections are so common in the UK partly because of the space cloverleafs take up. I think that on motorways, weaving sections (like you have in the middle of a c-leaf) can't be shorter than 2km. The only c-leafs in the UK are on lower speed roads. In effect the slip roads give time for drivers to adjust to the lower speed on a roundabout, so weaving, sharp angles etc aren't a problem, but directly off a motorway, they are a problem.
On the Double By-pass Highway Roundabout, it looks like there's a nasty conflict point where the highway offramp meets the roundabout. I realize conflict points are impossible to eliminate altogether. I was imagining myself entering that roundabout at near highway speed, and crossing the traffic exiting the roundabout. You can even see some of the CIMS slamming on their brakes, lol.
I like the design, though. I think that intersection/merge could use a tweak.
edit: I just realized calling a Double By-pass is fitting, lol. Could induce heart-attacks.
Oh, you have to yield when entering any roundabout. So yes, slowing is neccesary
@@YUMBL What do you have your 'follows the rules of the road' setting at? I swear I saw those drivers sailing thru that merge, oncoming traffics be damned. Maybe it's just normal functionality, but more obvious because there's only the one interchange to focus on.
I just thought it was kinda funny.
All of these apart from the partial cloverleaf variety are common in the UK
The other type that you haven't tried is the big wheel which is basically a huge roundabout spanning the highway (or going underneath) in 2 places which is super super common especially as service interchanges or where several medium roads meet a motorway in a more rural area...
It especially works well when you have more than 2 feeder roads joining
The big wheel sounds just awful to me, but i’m sure its great without being overused
With a double bypass, you can simply remove the roundabout and have a 2-phase signal intersection for left turn only. Depending on the traffic wanting to turn left, I think you can have 3 lanes intersection in a smaller footprint than a roundabout.
That's what they did in my city
That would be my preferred solution as well, though its not the topic of this video.
On the Partial Clover Leaf + Round-about, did you consider using a single lane off-ramp, and then pulling the exiting traffic off the continuing highway after the overpass?
I dont know what you mean
I love the Roundabout Partial Cloverleaf. 🙂
stumbled across your channel due to the robots suggestions in part due to being subbed to Biffa after watching 2-3 videos i ended up subbing to you. and have binge watched alot of your content getting ideas on how to make my cities better. I think I know why the robots suggested you. you are the "Bob Ross" of Skylines. keep putting out the great content
Thank you very much! :)
I noticed on the bypass roundabout you had traffic exiting right to go thru the round about, exit right and rejoin the highway. I suspect it may be a speed limit thing, if you increase it on the over pass, traffic not wanting to exit will stay on.
Hello
Looking at your round about at 4:43 you have cars that are coming from the motor way using the round about and getting back on.
We should tell them not to…
Love your work, thanks maaaate. Have liked on Steam too. Cheers from Aus.
Wat would a interchange look like with 3 bridges and only right turns (and left at the bridges )
How about the single bypass with a turbo roundabout?
double bybass is a beauty
Hahahaha I love the "Centipedes?" reference
Dude, any chance you could fix all the traffic in the South East of England? Couple of long weekenders, and I reckon you'd have it sorted right out.
I appreciate your vote of confidence, but I’m hardly qualified for anything irl 🤣
@@YUMBL Heh, well keep releasing great content anyway, that'll do in the meantime :)
They're building an AB2 parclo with roundabouts in Alberta currently, at the intersection of Highways 1A and 22. Google "Cochrane interchange". I'm curious how it would perform in your simulations. It's similar to your parclo at the end of the video, but without the slip lanes.
Well a dumbbell or dogbone is a service interchange. It's slightly better than a diamond, but I'd definitely not expect it to be able to handle all that much traffic. The interchange test map is definitely for system interchanges.
Service interchanges do fine on interchange test map. Just not the lower traffic density ones. A timed traffic light can also handle the traffic here.
I love the dumbell parclo! I’m stealing that!!!
The bypass roundabouts serve the highways into my city zones just fine. It must be the heavy cross traffic that causes issues or just the public transit of my city
Agreed
The real issue here is the number of interactions and number of cars flowing through. Straight thru bypasses are the most obvious way to lower the flow of traffic through the interchange to start with, which also offering the straight thru traffic the desirable "no slow down" route. The dogbone / dumbell could be significantly improved just by giving the north south a straight through option that would be faster than taking the traffic circles. That would lower the traffic in by a certain amount, and also significantly decrease the number of car to car interactions occuring.
Straight through traffic is a normal situation that interchanges generally need to accommodate for. The parclo did much better with this in mind.
I was hoping for sliplanes in the massive dogbone, but as someone stated a 2-2-2-2 split of the highways is probably not realistic for a dogbone and a 3-1-3-1 would be better as you'll expect a non even distribution of traffic and destinations. Maybe even a 3-2-2-1 as one end of the dogbone may be more popular, same with the highway.
Double bypass roundabout is my go to for console or vanilla games, easy to make and very high capacity
Yumbl! I noticed some lane mathematics issues with the one at 9:50ish mark (before the partial cloverleaf. Some cars went Highway>Roundabout>Back to same Highway. Least so you know.
Nice seeing the different ideas! 👌🏼 👍🏼
Thank you! I dont know that theres a great fix for cars going straight through the roundabout.
@@YUMBL guessing the lane connector mod wouldn't help that much?
Just the nature of cars sharing lanes in the roundabout. It requires a three lane road to force cars to use a specific exit, but thats not realistic or necessary here imo. Two should be enough, but you cant force them to use the lanes you want.
@@YUMBL ah okay, didn't know if that'd affect the flow or such.
Is there a roundabout version of a SPUI?
I love roundabouts in some situations.
Same!
Some time ago, i made a junction by trial and error with the same design of the double.bypass roundabout, but the roundabout instead of going anti-clockwise, it went clockwise
Clockwise makes sense, but it would be hard to convince people irl