Welcome to my blog. I will be discussing how traffic signals work, why they do what they do, and why you may be getting more reds than greens.
Traffic signals can be very complicated devices. Traffic signals may be pre timed, semi actuated, fully actuated, coordinated, uncoordinated or running with an adaptive algorithm. The vehicles can be undetected, Or detected by a variety of methods. Vehicle detection can be accomplished via pressure plates (very rare now), or detected by a variety of inductive loop wires, video detection and radar detection.
There are a variety of brands, makes, models, software versions and standards. I have extensive experience with Naztec Apogee, Econolite ASC/3, ASC/2 and 2/S and 8000, Traconex J-9, CJ and CJ-32, Peek 3000 and 9200, and LMD 8000 controllers. I also have worked on Eagle Epac, Wapiti 170's and VS-Plus controllers. These range between NTCIP, NEMA TS-1, NEMA TS-2, and CalTrans TEES Control environment.
What does all this mean? Well, the devil is in the details.
The photo at the top of this page is of a NEMA TS2 Type 1 traffic signal cabinet. The cabinet is a pole mount cabinet, and is quite full of hardware. The signal cabinet has an Econolite ASC/2S-2100 controller, with Reno 1600G Malfunction Management Unit, and Reno E1200 induction loop detectors. Not shown in the controller is an ATSI Frame Grabber - which was installed after the picture was taken.
This cabinet is configured to operate with up to 16 load switches, for a total of 16 specific movements, which can be programmed for any combination of vehicle, pedestrian and overlap movements totaling up to 16.
Great Post Thanks For sharing very useful information about Traffic lights, also known as traffic signals, traffic lamps and traffic control accessories, are signalling devices positioned at road intersections, pedestrian crossings, and other locations to control flows of traffic.
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