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does a stop light "sensor" your car? is that why it turns green when no cars are around if you pulled up to a red when there's no cars around?

my hubby told me stoplights sensor on coming cars so he yells and screams at the light when it doesnt turn green when there's no cars around "why arent you turning green!! there's no one HERE!"

 
americansugar80

Asked by americansugar80 at 6:02 PM on Feb. 27, 2009 in Just for Fun

Level 22 (12,423 Credits)
This question is closed.
Answers (5)
  • Yes you have to be stopped just right it seems. like a turnning lane you cant be to far back it will not turn thinking no one needs to turn.
    snakeeyes

    Answer by snakeeyes at 6:05 PM on Feb. 27, 2009

  • Some streets have timers on them and they will turn green from the timer... not necessarily from cars pulling up to it. The sensor on the top of the light is for police and ambulances to change the light we do not have anything to change the light in our cars...
    hotty2u14

    Answer by hotty2u14 at 6:11 PM on Feb. 27, 2009

  • There are stop lights on timers and those that are set off by a detector in the road. I don't know of stop lights set off by sensing the car with an above the car sensor, but there could be.
    Bmat

    Answer by Bmat at 6:16 PM on Feb. 27, 2009

  • "There are all sorts of technologies for detecting cars, and by far the most common technique is the inductive loop detector. An inductive loop is simply a coil of wire embedded in the road's surface. You can often see these big rectangular loops cut in the pavement because the compound is obvious. The traffic signal system constantly tests the inductance of the loop in the road, and when the inductance rises to certain threshold, a vehicle is detected and traffic signal system will allocate green time accordingly."

    ~Henry Liu is an assistant professor in the Department of Civil Engineering.~
    Southerncharmes

    Answer by Southerncharmes at 6:19 PM on Feb. 27, 2009

  • There are sensors on traffic signals that emergency vehicles like fire trucks and ambulances can trigger to turn the lights in their favor.
    jburg2541

    Answer by jburg2541 at 11:38 PM on Feb. 27, 2009