Subject: / Criteria for congestion- traffic signals
This time it has to do with traffic signals and how they appear on the congestion management system. NJDOT creates a list of signals. I recently had a meeting with our planning folks to discuss the screening process, priority ranking and end result of applying the NJCMS tool to NJ’s roadway network to identify candidate locations for Computerized Traffic Signal Systems (CTSS). The current process is as follow:
* Planning staff first screened continuous sections of NJCMS links - specifically divided arterials - based on length, # of traffic signals and v/c ratios;
* Based upon an evaluation of the existing CTSS corridors in New Jersey; Planning folks next developed minimum criteria that a candidate location must meet:
§ At least 5 signals § At least 2.5 miles between the first and last signal § At least 1.5 signals per mile § At least one link with an NJCMS link v/c ratio of 1.10 weights were then applied as following
V/C ratio 40% Traffic volume (ADT) 20% Functional class 20% Signal per mile 20%
I questioned the ranking criteria breakdown and the weights, especially the one (highlighted), between v/c ratio and ADT, arguing that a roadway with high ADT and slightly lower V/C ratio should be a higher priority than one with low ADT but a higher V/C ratio.
Do you folks have a similar system? if not what do you do? any suggestions to my concern if we keep the same weights and criteria?
From: / "Weatherholt, Aaron A" <>Subject: / Re: Criteria for congestion- traffic signals (submitted again)
Illinois does not have a similar system. Our programming for individual improvements whether signals or pavement are done by each individual district. We have 9 districts.
From: / Tom Blair <>Subject: / Re: Criteria for congestion- traffic signals (submitted again)
Anyway, not sure exactly know what you mean by "how they appear on the congestion management system" or "applying the NJCMS tool to NJ’s roadway network to identify candidate locations for Computerized Traffic Signal Systems (CTSS)".
A real simple answer is MoDOT in St. Louis has centralized signal control system operated from our TMC!!! For approximately 1000 signalized intersections!!! We don't have a complex priority scheme either now or ever. We know which of our systems are bigger than others, so they obviously get more attention, but we've never gone to the ends mentioned below - assuming that we're talking about the same thing.
A key facet of our arterial management results are partnering with our two large public partners St. Louis City and St. Louis County (combined we own and operate 99% of the important signalized intersections in the St. Louis region). Also, these partners have a pretty robust centralized signal control system that is compatible with ours.