I see a definite advantage over places where you used to have to wait for the light to make a left turn. It also seems to be safer than a roundabout, where people failing to yield to those in the circle is always a risk. I'm not yet sure why this is better than the usual clover design except that it seems the diamond uses less space as you don't need to drive in a 270% turn.
+Utah Department of Transportation How is it better than the cloverleaf pattern? That also eliminates left turns, have less conflict points, no lights, no limit on straight through traffic, let alone it can take less space and less confusion.
it's not better than cloverleaf. It is less expensive, especially for retrofitting an existing diamond where you can reuse many of the existing ramps. It is, however, definitely better than the standard diamond if the majority of the traffic is turning.
Not just you can. Double Crossover Merging Interchange (DCMI) is akin to an independently developed (to DDI) grade-separated free-flowing version of the DDI.
The way they have this, at some point someone not familiar with this intersection is going to turn right into oncoming traffic because the lines are worn out and the signage isn't easy to see. That is my impression anyway.
Safer - maybe . Slower - absolutely . Waste of fuel - a lot . Best solution I have ever seen is runabout over or under freeway . If no one is coming , you are free to merge . And you can enter if gap is big enough . It does not need lights , maintenance is lower , it is at least as efficient as lights regulated , but on low traffic it is much faster . Point of traveling with car is to get there , and on time , not to keep waiting in traffic jam on traffic light .
Safer: Yes, studies and real world data prove it Slower: No, they are extremely efficient, studies and real world data prove it Waste of fuel: Same as above Roundabout interchanges are great, except they are doomed even in Europe. Why? Bridges are obscenely expensive. They are the most expensive part by a long shot for this type of infrastructure. Since roundabout interchanges require more bridges, they are getting left behind. Even in England, formerly the land of roundabout interchanges, they are getting replaced with dumbbell interchanges (which perform objectively worse than these in heavy traffic, btw).
We would need this kind of infrastructure everywhere to make "Autonomous Cars" a reality in future. Until that happens everywhere, Autonomous Cars is a nice buzzword to keep businesses moving...
Roundabouts are not suitable for high traffic whatsoever. This is 4x3 lanes, man. Roundabouts can maybe manage 1 or 2 lanes from all directions. Roundabouts would limit pass-through traffic throughput (going straight) and necessarily involve conflict points, which this design doesn't have for at least half of the traffic (thanks to the underpass)
Those take up so much more space and if they were to go with that instead, they would need to add in more bridges and also take into account Semis to which I am experienced with driving, and come across a few poorly designed rotaries with too small diameter or not enough lane width to account for the trailer trailing.
Glen, the Arc de Triomphe in Paris, France has a ten abreast no marked lane roundabout or traffic circle, what a traffic headache/nightmare and no lights.
Nuestros ingenieros determinaron que un cruce de DDI sería la mejor opción para esta localización porque podría ser construido más rápidamente, más económicamente y mejoraría seguridad en el área. El cruce también beneficia a motoristas al permitir más circulación abierta entre la autopista y el cruce.
I feel like I'm missing a crucial understanding of this. We are about to get one of these in VA. In the current model, the left-turn lights are yield on green most of the time and straight through traffic only stops to allow the lefts onto the Interstate, but most of the time, straight through traffic proceedes without stopping. In this model, straight traffic (the majority of the traffic) stops to allow the other straigh through traffic through, so the lights can't stay green for more than 50% of the time. How is this better? The animation shows extremely light traffic. Do you have an animation that shows what happens when the traffic is 2x or 5x that level? Also, does this model prevent idiot drivers from pulling into an intersection when they have a green, even though there's not enough room to make it across (because the queue for the next light is full)?
I come across that scenario even with the older intersection designs, I just watch those in front of me get stuck and causing others to get mad at their stupidity and as a semi driver even in my own automobile I just wait the light and ignore those behind me honking to move, then when I got space I go forward and look back when I have to stop and watch as those behind me are now blocking the intersection all because they are so in a hurry to no where truly important. I have yet to go through a DDI, but from this and another video, these are nicer than the old 4 ways they used to be.
yeah, well those people are idiots. I was stopped at a green light because there wasn't enough room in front for me to avoid blocking the intersection and the guy behind me honked and I would have enjoyed the opportunity to ask, "so, just so I am clear, you would like for me to pull forward and then pull up behind me, fully blocking this intersection? An intersection to that Hospital. So that when the ambulance comes carrying a child from a near fatal accident, it is unable to get through?"
Even better is idiots who get hit by trains because they sit on the tracks instead of waiting on the other side. I guess it's some psychological thing about having a lot of space in front of you.
Those idiots forget the rule of NO BLOCKING Intersections or driveways. Even I find myself in that situation at times when a bit to focused but it is not a busy intersection. Oh and also they do the same at RR crossings as well.
Hopefully this answers the question... There will probably be traffic lights that are green arrows instead of circles. But regardless, it is a turn onto a one-way which is actually allowed on red after a full stop in most states just like a right on red (though I'd imagine this will be no turn on red). A green light on to a one-way is not yield on green like a turn across traffic. The yield on green is relating to oncoming traffic, not necessarily the direction of the turn.
This D= Doubles twice joints .....it's more recent interchange .The best way to save money and risks & avoid these problems is two levels no stop butterfly if we put & spend once only money (instead) our lives , time & environment otherwise save one value... Best regards Dr.Moved Care@
I spoke with one of our engineers and the benefit of a DDI is the elimination of the left turn traffic signals which provides more efficiency for those trying to enter the freeway. We have also seen a much lower occurrence of crashes.
I see no difference in this configuration except when exiting the expressway you will cross the oncoming traffic lanes on the opposite end of the bridge instead of the near end so where is the benefit. I see a lot of confusion and accidents just to do something different.
If you look at a four way there is more intersection and thus higher chance of traffic, similar issue with cloverleaf and rotary or roundabout would cost much more. I have yet to drive through a DDI but before watching this or a previous other video on them, they seem much less congested due to less intersection and can handle more traffic in comparison.
I've only seen this and other animations of a DDI. One aspect that bothers me is the significant dependence on markings on the road surfaces. Especially with heavy traffic, these markings fade, and become difficult to see, leaving drivers unsure of what to do. This can become critical during heavy rainstorms, and more so with rainstorms at night. (I have experienced such uncertainty on the Garden State Parkway in NJ when trying simply to stay in my chosen lane. And there are no DDIs on the GSP.)
In your CFI Tutorial video you say: "the fewer crossing lines of traffic, the better". With this design, you actually added more crossing lines of traffic, as oposed to a clover.
Clovers as nice as they look are horrible when using them onto and off of the roadway with the on ramp and off ram sharing the same entry/exit lane. Thus you go exiting cars going at road speed and entering vehicles for example semi tractor-trailers which I am experienced to drive speeding up to merge with the other vehicles already going roadway speed. As for the comparison of this to a dual four way stop, this does have fewer INTERSECTION points per intersection.
That is typical for a cloverleaf, look at Exit 23 on I-495 in Westboro, MA. not same shape but similar design. Aside from the Exit 133 having a collector road that connects two of the loops off the interstate. If they want the cloverleaf to work more smoothly, they need to have designed and built it with an extra lane (collector) longer than the access lane you see in those two similar examples. for safer merging and less congestion. But even that would add to the confusion already inherent in the original design. Looked at the interchange on Google Map - Satellite view.
***** Stupid people use the roads everyday. Accidents at roundabouts go down in number when people get used to them and the severity of accidents are much less than those at traffic lights.
and cloverleafs still suck since they still have 4 sections of intersection on both road levels despite they lack stop signs and lights and now you go oncoming speeding up with exiting slowing down, and most I come across do not get what the turn indicators are for.
so many exits on the left.. there's no way this can be considered safer &/or more efficient with lefthand exits - left exits are a major cause of back-ups & congestion because it keeps slower traffic on the wrong side of the road.. you want exiting traffic [slower] to merge right & let the onward flow of traffic to remain left & pass safely. plus, in this scenario, i can already see cars sitting each other off to get into the left lanes for the freeways - not a doubt in my mind there will be drag races from the stoplight to the left exit lanes.. this concept would be better if it implemented righthand exits instead of lefthand ones - it does look pretty though..
Welp, they are getting put up all over the place, and the data just keeps rolling in. These things are kind miracles, increasing safety while hugely improving traffic flow.
I wish the way roads are split up would be possible in the game cities skylines! Id replicate this DDI ingame :-]
just created a ddi
You can with one way streets or modded roads
It is possible
fender bender hit-and-run at 0:48 heading left. Nicely done, white car. I'm watching you!
edit: and at 3:33 the white SUV running the light. Yikes!
Crazy computer algorithms those are.
I see a definite advantage over places where you used to have to wait for the light to make a left turn. It also seems to be safer than a roundabout, where people failing to yield to those in the circle is always a risk. I'm not yet sure why this is better than the usual clover design except that it seems the diamond uses less space as you don't need to drive in a 270% turn.
Tucson Arizona is getting 1 first one I can't wait
St George UT already has one. Already used to driving it.
@@tylerclitso1544 nice
Wow did you note diamond interchange
Looks cool. Less space use than a clover. Less merging. Seems good to me
This is probably the only time in the USA where you can drive on the wrong side of the road :P
I couldn't help but notice that no one turning left used a signal light
+Utah Department of Transportation
How is it better than the cloverleaf pattern? That also eliminates left turns, have less conflict points, no lights, no limit on straight through traffic, let alone it can take less space and less confusion.
Not sure for this case, but I know of PTV products that seem excellent for that purpose
it's not better than cloverleaf. It is less expensive, especially for retrofitting an existing diamond where you can reuse many of the existing ramps. It is, however, definitely better than the standard diamond if the majority of the traffic is turning.
It is better than a cloverleaf because there is no weave condition for a short distance at high speed. Not all conflict points are equal.
I can improve on this just by having the DDI overpass each other instead of a light controlled intersection.
Robert Schuster, you can't.
You can't.
Not just you can. Double Crossover Merging Interchange (DCMI) is akin to an independently developed (to DDI) grade-separated free-flowing version of the DDI.
Explain why
The way they have this, at some point someone not familiar with this intersection is going to turn right into oncoming traffic because the lines are worn out and the signage isn't easy to see. That is my impression anyway.
i like it
Safer - maybe .
Slower - absolutely .
Waste of fuel - a lot .
Best solution I have ever seen is runabout over or under freeway . If no one is coming , you are free to merge . And you can enter if gap is big enough . It does not need lights , maintenance is lower , it is at least as efficient as lights regulated , but on low traffic it is much faster . Point of traveling with car is to get there , and on time , not to keep waiting in traffic jam on traffic light .
However, this is not low traffic by any means.
Safer: Yes, studies and real world data prove it
Slower: No, they are extremely efficient, studies and real world data prove it
Waste of fuel: Same as above
Roundabout interchanges are great, except they are doomed even in Europe. Why? Bridges are obscenely expensive. They are the most expensive part by a long shot for this type of infrastructure. Since roundabout interchanges require more bridges, they are getting left behind. Even in England, formerly the land of roundabout interchanges, they are getting replaced with dumbbell interchanges (which perform objectively worse than these in heavy traffic, btw).
We would need this kind of infrastructure everywhere to make "Autonomous Cars" a reality in future. Until that happens everywhere, Autonomous Cars is a nice buzzword to keep businesses moving...
heard about roundabouts?
Roundabouts are not suitable for high traffic whatsoever. This is 4x3 lanes, man. Roundabouts can maybe manage 1 or 2 lanes from all directions. Roundabouts would limit pass-through traffic throughput (going straight) and necessarily involve conflict points, which this design doesn't have for at least half of the traffic (thanks to the underpass)
Just look for Slaviia square in Belgrade (trg Slavija Beograd). 7 city streets, 5 of which have high multi lane traffic. It is a mess that works.
Those take up so much more space and if they were to go with that instead, they would need to add in more bridges and also take into account Semis to which I am experienced with driving, and come across a few poorly designed rotaries with too small diameter or not enough lane width to account for the trailer trailing.
wrong, roundabouts can easily handle 3 lanes from all directions and can be built with or without lights
Glen, the Arc de Triomphe in Paris, France has a ten abreast no marked lane roundabout or traffic circle, what a traffic headache/nightmare and no lights.
Nuestros ingenieros determinaron que un cruce de DDI sería la mejor opción para esta localización porque podría ser construido más rápidamente, más económicamente y mejoraría seguridad en el área. El cruce también beneficia a motoristas al permitir más circulación abierta entre la autopista y el cruce.
the ramps where traffic commes they ould remove lights from there
I feel like I'm missing a crucial understanding of this.
We are about to get one of these in VA. In the current model, the left-turn lights are yield on green most of the time and straight through traffic only stops to allow the lefts onto the Interstate, but most of the time, straight through traffic proceedes without stopping.
In this model, straight traffic (the majority of the traffic) stops to allow the other straigh through traffic through, so the lights can't stay green for more than 50% of the time. How is this better?
The animation shows extremely light traffic. Do you have an animation that shows what happens when the traffic is 2x or 5x that level?
Also, does this model prevent idiot drivers from pulling into an intersection when they have a green, even though there's not enough room to make it across (because the queue for the next light is full)?
I come across that scenario even with the older intersection designs, I just watch those in front of me get stuck and causing others to get mad at their stupidity and as a semi driver even in my own automobile I just wait the light and ignore those behind me honking to move, then when I got space I go forward and look back when I have to stop and watch as those behind me are now blocking the intersection all because they are so in a hurry to no where truly important. I have yet to go through a DDI, but from this and another video, these are nicer than the old 4 ways they used to be.
yeah, well those people are idiots. I was stopped at a green light because there wasn't enough room in front for me to avoid blocking the intersection and the guy behind me honked and I would have enjoyed the opportunity to ask, "so, just so I am clear, you would like for me to pull forward and then pull up behind me, fully blocking this intersection? An intersection to that Hospital. So that when the ambulance comes carrying a child from a near fatal accident, it is unable to get through?"
Even better is idiots who get hit by trains because they sit on the tracks instead of waiting on the other side. I guess it's some psychological thing about having a lot of space in front of you.
Those idiots forget the rule of NO BLOCKING Intersections or driveways. Even I find myself in that situation at times when a bit to focused but it is not a busy intersection. Oh and also they do the same at RR crossings as well.
Hopefully this answers the question... There will probably be traffic lights that are green arrows instead of circles. But regardless, it is a turn onto a one-way which is actually allowed on red after a full stop in most states just like a right on red (though I'd imagine this will be no turn on red). A green light on to a one-way is not yield on green like a turn across traffic. The yield on green is relating to oncoming traffic, not necessarily the direction of the turn.
I know everyone hates it, I actually like it.
Why clover leaf is not suitable here
This D= Doubles twice joints .....it's more recent interchange .The best way to save money and risks & avoid these problems is two levels no stop butterfly if we put & spend once only money (instead) our lives , time & environment otherwise save one value...
Best regards Dr.Moved Care@
I spoke with one of our engineers and the benefit of a DDI is the elimination of the left turn traffic signals which provides more efficiency for those trying to enter the freeway. We have also seen a much lower occurrence of crashes.
We contracted with one of our local firms for it's creation. I'm not sure what was used since it wasn't done in house.
The cars twitch when they change lanes! 2:45 someone gets cut off and nearly causes an accident!
This is not intuitive for the USA, since when is driving on the left American.
There are 2 of these in Michigan
Not to mention a whole lot of tax dollars spent to be different.
floating car 2:35 white SUV aliens are real
I don't know why I'm here !!!?
I see no difference in this configuration except when exiting the expressway you will cross the oncoming traffic lanes on the opposite end of the bridge instead of the near end so where is the benefit. I see a lot of confusion and accidents just to do something different.
If you look at a four way there is more intersection and thus higher chance of traffic, similar issue with cloverleaf and rotary or roundabout would cost much more. I have yet to drive through a DDI but before watching this or a previous other video on them, they seem much less congested due to less intersection and can handle more traffic in comparison.
I've only seen this and other animations of a DDI. One aspect that bothers me is the significant dependence on markings on the road surfaces. Especially with heavy traffic, these markings fade, and become difficult to see, leaving drivers unsure of what to do. This can become critical during heavy rainstorms, and more so with rainstorms at night. (I have experienced such uncertainty on the Garden State Parkway in NJ when trying simply to stay in my chosen lane. And there are no DDIs on the GSP.)
@@hankmike9902 let’s be real though New Jersey probably won’t get any DDI’s anytime soon, they’re just barely phasing out the jughandles now
What program was used to create this animation?
City skylines
In your CFI Tutorial video you say: "the fewer crossing lines of traffic, the better".
With this design, you actually added more crossing lines of traffic, as oposed to a clover.
Clovers as nice as they look are horrible when using them onto and off of the roadway with the on ramp and off ram sharing the same entry/exit lane. Thus you go exiting cars going at road speed and entering vehicles for example semi tractor-trailers which I am experienced to drive speeding up to merge with the other vehicles already going roadway speed. As for the comparison of this to a dual four way stop, this does have fewer INTERSECTION points per intersection.
Check out Exit 133 in Stafford, VA on I-95. There is a seperate lane all together for entry/exit ramps.
That is typical for a cloverleaf, look at Exit 23 on I-495 in Westboro, MA. not same shape but similar design. Aside from the Exit 133 having a collector road that connects two of the loops off the interstate. If they want the cloverleaf to work more smoothly, they need to have designed and built it with an extra lane (collector) longer than the access lane you see in those two similar examples. for safer merging and less congestion. But even that would add to the confusion already inherent in the original design.
Looked at the interchange on Google Map - Satellite view.
But you also remove crossing lines of traffic, namely the left turns on and of the highway. You add 2 and remove 4 crossing lines.
What program have you used to create this simulation?
City skylines
Roundabouts work better.
***** Traffic lights always create backups. Roundabouts rarely create backups.
***** Stupid people use the roads everyday.
Accidents at roundabouts go down in number when people get used to them and the severity of accidents are much less than those at traffic lights.
not physically possible to put roundabouts in a freeway interchange that is more efficient, dumbass
William Patton Type in Malta, NY in Google maps and look at interstate 87s interchange. Research before typing please.
William Patton AGREED!
This intersection seems awful compared to a clover. This type of intersection slaps 4 traffic lights when a clover doesn't need any.
and cloverleafs still suck since they still have 4 sections of intersection on both road levels despite they lack stop signs and lights and now you go oncoming speeding up with exiting slowing down, and most I come across do not get what the turn indicators are for.
This is a better alternative if there isn't any space.
A cloverleaf does not work with this road.
so many exits on the left..
there's no way this can be considered safer &/or more efficient with lefthand exits - left exits are a major cause of back-ups & congestion because it keeps slower traffic on the wrong side of the road.. you want exiting traffic [slower] to merge right & let the onward flow of traffic to remain left & pass safely.
plus, in this scenario, i can already see cars sitting each other off to get into the left lanes for the freeways - not a doubt in my mind there will be drag races from the stoplight to the left exit lanes..
this concept would be better if it implemented righthand exits instead of lefthand ones - it does look pretty though..
Welp, they are getting put up all over the place, and the data just keeps rolling in. These things are kind miracles, increasing safety while hugely improving traffic flow.