Not to steal any thunder from OP but I'll happily answer. There are many types of detectors in intersections... Inductive loops, camera, infrared, ped push button, sensys wireless "pucks". All sorts of things. Anyways, these detectors feed to input cards and racks that then send a signal to the traffic controller placing a "call" telling the controller to service that direction. In the event that the detector fails in some way the card in the detector rack will default to always show a call. Imagine a broken detector and you pull up to an intersection never to get a green light. So instead, the card will make that direction alway get a green every cycle whether a vehicle is present or not. So the likely scenario is one of four things. One a detector is damage. Two the pedestrian push button is damaged or stuck on, three the light is unactuated(timed with no detector), or four the city is a bunch of idiots and won't allow the tech to service it properly. Hope that helps haha.
Jms_1989773 karma
Not to steal any thunder from OP but I'll happily answer. There are many types of detectors in intersections... Inductive loops, camera, infrared, ped push button, sensys wireless "pucks". All sorts of things. Anyways, these detectors feed to input cards and racks that then send a signal to the traffic controller placing a "call" telling the controller to service that direction. In the event that the detector fails in some way the card in the detector rack will default to always show a call. Imagine a broken detector and you pull up to an intersection never to get a green light. So instead, the card will make that direction alway get a green every cycle whether a vehicle is present or not. So the likely scenario is one of four things. One a detector is damage. Two the pedestrian push button is damaged or stuck on, three the light is unactuated(timed with no detector), or four the city is a bunch of idiots and won't allow the tech to service it properly. Hope that helps haha.
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