Split Phasing a Traffic Signal (w/instructions!)
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- čas přidán 24. 06. 2024
- You may be asking: What is Split Phasing?
Split phasing a traffic signal is a process that separates phases by approach, allowing one side of the street to be serviced at a different time than the other. For example, an intersection will provide a green to all vehicle movements in one direction (then yellow/red), followed by the opposite side servicing their respective green for all movements in that direction(then yellow/red).
If you're interested, in this 10 step, 23 page report, you'll see how we reconfigured the intersection for split phase operation. Here's the link:
www.streetsmartstraffic.com/s...
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I had to reprogram my 170 controller (BiTrans software) to make phase 4 and 8 exclusive phases and rewire my phase 3 head together with 8, and phase 7 together with phase 4. They had road work in the vicinity (lawn and pavement work) that resulted in less lanes in the intersection. Programing the CMU was unnecessary. I just added jumper plugs on the load switch socket. Coordination parameters had to be reconfigured. This was done at my old friends backyard, not an actual intersection.
LOL! Marc, I was following along the whole way and then I got to 'my friends backyard'....too funny! But glad you were successful with the conversion. Thanks for your input!
I guess split phasing is used also when you want a delay on the oncoming traffic ("Delayed Green" sign) in a T intersection, to faciliate easier left turns on those on the main road.
Hey Sebastian...they could possibly set it up that way. I would guess though that its all done in the signal controller thru timing. Good insight though!
I'm curious about intersections where they have buried sensors to detect traffic in each lane yet the lights walk their way thru the entire sequence. It's so aggravating to see traffic stopped at 3 of the 4 directions and no traffic at all from the direction that has the green. I could understand that if sensors or equipment fails the lights would default to a routine that doesn't exclude anyone, but doesn't the equipment ever get fixed? Some intersections are so notorious that you avoid them if possible.
Often it’s because of malfunctioning equipment.
A short or open on a loop detector will show the position as occupied which the controller receives as a call for service. The controller will service the call and if the call for service doesn't clear after a number of cycles it will ignore further calls. This is in case a vehicle is disabled at the loop. Then in this case it will be service after it's normal timing expires.
GREAT Question! Looks like it was answered below. To answer your question- "Doesn't the equipment ever get fixed?" Well, that's a host of different answers...
1) Understaffed personnel has so much on their plate that they don't get to it
2) The personnel in charge of maintaining the signal doesn't know how to fix it
3) It doesn't get reported and the maintainer doesn't know it needs fixed.
4) Unfortunetly, some maintainers just don't care (thats not too often)..it usually leads back to them not knowing how to fix it
Thanks for commenting!
Love the content! I'm an electronics nerd. What do yall do with the old controller boxes and other stuff that gets replaced or upgraded? I would love to get my hands on a controller box 😆
You'd probably enjoy studying in depth the way GMs Dash 2 electrical system for its 70s and 80s model locomotives works then. Think there's something like 20 separate modular circuit cards in the control cabinet at the max when all the right options were checked off.
Many times when there are major upgrades done, all the old equipment is brought back and placed into inventory for spares. You'll also see agencies unload them onto govdeals.com
You can usually get pallet loads of equipment for pennies on the dollar. You'll also find traffic signal equipment on ebay. I should probably make a video about this subject as I've had many people ask your same question...lol. Hope you find something! Thanks for commenting!
@@SOU6900 Actually, I'll look into those, thanks! I never thought one of those would be so full of sophisticated electronics, I mean not so much back then. Today, definitely lol. 😎
@digitalchaos1980 Actually is depending on how you look at things it wasn't until 69 when GM-EMD built the DD40X model for Union Pacific that EMD started using circuit cards, but it wasn't until January 1st of 72 that the Dash 2 series locomotives released. The bit 8 axle DD40X units were basically test beds for the system. The cards for the DD40Xs, aka 6900s or Centennials, were originally assembled and soldered by hand. Around 84 or so, they replaced the Dash 2 cards with microprocessors.
@@streetsmartstraffic Awesome man, thank you letting me know! I'll check the site out, and look forward to a vid about it! 😎
Could you show a traffic signal near a railroad crossing and show how it knows to clear a particular direction before activating the railroad crossing lights
Great question! You're the 2nd person to ask traffic signal connectivity to a rail road in the past week. I have it on my 'list' for production.
Railroad preemption
@@cusaris6185 You're the 3rd person! On the list! Thanks!
@@streetsmartstraffic Any 332 cabinet content?
@@cusaris6185 I've worked on them before but the region I cover now only has NEMA cabinets. But it seems like most of the troubleshooting and programming is comparable. Are the 332 cabinets what you currently work on?
curious- what is the plastic telephone network interface laying on top of the wires for? (next to the laptop)
I wanna know too.
A very interesting career field👍👍
Great Question!!
The answer: Old Technology! LOL.
At one point, that telephone box was used for connection to the traffic signal controller. 'Dialing' it up from the office server would allow connecting remotely. That would provide the ability to make timing changes and view operation.
That has since been upgraded to fiber-which allows a whole lot more bandwidth, including streaming video from the detection cameras.
Anyway, for some reason, that wasn't removed when we upgraded. Guess I should get that thing outta there! Thanks for your question!
@@streetsmartstraffic I bet those old school dial-into controllers had default usernames and passwords too. 🤣
@@SharpBalisong lets see....
user: admin
password: 1234
LOL!