Reviewing Traffic Signal Designs

A subscriber had asked for this video, we go over plan review, and a little bit about how traffic signal plans look, and what some of the things on the plans mean.

[@LuisLopez-rg4bs]

What a great video I haven’t worked on traffic signals in over 25 years great refresher

[@jacksonfive5478]

Very cool thanks for sharing 👍

[@jasonkennedy7744]

Love seeing a WA State project. I work for City of Federal Way Public Works-Traffic

[@metalbill]

My supervisor handed me the responsibility of doing contractor punch lists on jobs, measuring intersections to calculate timing, programming controllers and MMU’s and meeting with contractors early AM to start a new or modified signal. I think it’s fun. And I’ve only been in the field 3 years. I’ve picked this up very fast and thoroughly. Plans I see are slightly different than yours but still convey the same information. Keep the videos coming!

[@kirkm4079]

Cool to see things shown a little differently and I haven't really seen the terminal wiring plan before.

[@trafficsignalstraining7673]

Usually you will see terminal wiring diagrams in more in-depth plans. If you are building a brand new signal, you might not necessarily need this, but because of the fact that there is existing field wiring, some of which is to be replaced, this portion of the plans exists. I think all of this also depends on the design consultant.

[@stephenfry-gdot]

​@@trafficsignalstraining7673 I am quite intrigued by your use of line diagrams. We (GDOT) generally do not include line diagrams with our signal plan sheets (as the designers/EOR) but instead call-out with note-leaders the number/type of conduits. The actual wire/lead-in connections are based upon our Stan-Specs Sec 647, Sec 925, Sec 937, etc. and the other relevant non-GDOT standards. This is true even for retrofits and partial upgrades. In fact, we just recently started not requiring input-file pin charts for standard 8-phase RBC/split-phase locations. We do, however, include line diagrams for systems requiring fiber interconnect (but these are quite rare outside of the ATL, where we have switched to a 4G-router system).

[@MikeyDowJonesFx]

Is it possible if you can make a video explaining all the details and elavations with the traffic lights 🚦. I’ve all kind of inspection before but never that and I was asked in a interview to find this stuff and had no idea where it was 🤦🏾‍♂️

[@erk-1]

Can you please make a video explaining min gap, max gap, and extensions?

[@trafficsignalstraining7673]

Great idea💡

[@bryanc.5463]

You don’t need to show the new wiring and conduit crossing locations under road on the first signal page? At least for quantity estimation purposes-

[@trafficsignalstraining7673]

These plans were for an existing signal that was being upgraded, there's no new conduit being installed. The existing conduits and the new wire that's being run in them is represented in the conduit table.

[@bryanc.5463]

@@trafficsignalstraining7673 the signal work wasn’t apart of the widening for the right turn lane? If it was, I think there’s have to be a little added conduit to accommodate relocations.

[@trafficsignalstraining7673]

@@bryanc.5463 There wasn't any widening, this intersection just had a new pole and some ADA mitigation.