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by **ARIESHEART** on Tue Jan 22, 2013 9:24 pm

Have you fellas ever used volume density timings on your existing NEMA(all types)controller?I used to have a simulated timing data sheet many years ago.I understood it then.Unfortunately,I forgot the basics of these functions.My M40/50 SEPAC controllers have more of an advance volume density function which I never used before."Cars Waiting"is an example of the advance volume density modes.Does"Type 3"detection play together with these modes?

by **RYGDWW** on Tue Jan 22, 2013 10:04 pm

Volume density control functions are designed for detector placement about 3 to 4 seconds upstream of the intersection at speeds about 35 or so. There are two primary functions...one is the timing of the initial green, based on the cars that have crossed the detector on red and are now queued at the intersection...and the other is gap reduction, to identify a good phase termination point under heavy traffic.

Check this for some good info...

http://www.ite.org/membersonly/itejourn ... A74A08.pdf

by **RunsWithCrouse-Hinds** on Tue Jan 22, 2013 10:40 pm

I can post more info later, but here's some additional reading for the moment:

http://forums.signaltraffic.com/viewtopic.php?f=15&t=7591&p=99066&hilit=volume+density#p99066

http://ops.fhwa.dot.gov/publications/fhwahop08024/chapter5.htm#5.5

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The Basics Of Volume Density Timing?

The Basics Of Volume Density Timing?

Re: The Basics Of Volume Density Timing?

Re: The Basics Of Volume Density Timing?

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