What triggers a red light camera?

Discussion in 'Community Discussion' started by theuserjohnny, Sep 14, 2012.

  1. theuserjohnny macrumors 6502

    Jul 7, 2012
    Odd situation, so I was pulling up to the light to turn right... and as I stopped the lights began to flash? And I was wondering if there was a situation in which I triggered it? From what I remember I was coming in kinda fast when I stopped and it could be possible that when I stopped I may have gone slightly over the line... but my car wasn't so far into the intersection that it was blocking anything. I stopped at where I would typically stop when turning this light in which I'm slightly in so that I can get a better view of the oncoming traffic before turning.

    I'm most likely just being paranoid. I didn't run the light but I'm just curious as to why the lights just started to flash. I wasn't paying attention to any of the other cars so I'm not sure if someone else may have caused it and I just happend to stop at that place when it all happened.
  2. Rodimus Prime macrumors G4

    Rodimus Prime

    Oct 9, 2006
    triggering it does not mean a ticket will be issued. It could be you went slightly farther forward than the line so it triggered but since you did not run it then it is tossed out.
  3. killerrobot macrumors 68020


    Jun 7, 2007
    Could've been someone else going the opposite way that triggered it.

    There was a whole mythbusters episode dedicated to getting past radar detectors and redlight cameras. I believe the cameras are calibrated to flash at certain speeds and if I remember correctly, a hawk flying fast enough was capable of setting off the redlight cameras as well.

    I don't think you rolling up to a line would have ever caused the light to flash.
  4. AlphaDogg macrumors 68040


    May 20, 2010
    Boulder, CO
    FWIW, humans actually review the images recorded by red light cameras before issuing tickets.
  5. tech4all macrumors 68040


    Jun 13, 2004
    I've had the red light cameras flash on me a couple of times on a GREEN light. :rolleyes: :eek:

    That's good to know since these do go off for no reason sometimes.
  6. Mr. McMac Suspended

    Mr. McMac

    Dec 21, 2009
    Far away from liberals
    What triggers the red light cameras? Local government greed, that's what :rolleyes:
  7. imthenachoman macrumors member

    Aug 18, 2008
    No trigger. They take pictures at a set interval. Some only take for a few seconds after they turn red. Some keep taking.
  8. tech4all macrumors 68040


    Jun 13, 2004
    Govt greed yea, but at the same time red light runners need to pay for running a light. A red light does not mean continue on for another 3 seconds. And yes that does happen in my area. And yes I do start driving when my light turns green (just enough to scare the crap out of them) and I'll honk at them and wave them a special sign. :D
  9. theuserjohnny thread starter macrumors 6502

    Jul 7, 2012
    Oh that's good news to hear. I think I'll be fine due to the main fact that I didn't run the red light. I think I was just being paranoid...
  10. Illuminated macrumors 6502a


    Sep 25, 2008
    Do you mean that the red light had a flashing white stripe?
  11. thewitt macrumors 68020


    Sep 13, 2011
    Low energy radar senses movement away from the camera when the light is red, triggering the camera.

    People review the images - the system itself cannot read your license plate - and write the ticket if you are actually breaking the law.

    In Malaysia they snap two pictures and so they can tell if you went thru the intersection or stopped part way.
  12. ideal.dreams macrumors 68020


    Jul 19, 2010
    You'll be fine. Same type of thing happened to us before - we were driving along and stopped really quickly at a red light and it triggered the camera. We did actually stop though and were never issued a ticket.
  13. thatoneguy82 macrumors 68000


    Jul 23, 2008
    Beach Cities, CA
    You probably crossed the pedestrian crosswalk while the "walk" signal was in place for pedestrians. OR It was a no right turn on red lights (I've seen many of these). Ignorance is no excuse for the law, sorry to say. But, if not any of these, it was probably malfunctioning. You would know if it took a picture of YOU and not someone else. You will see a bright flash straight ahead of you, instead of something in your peripheral vision for other cars going through the red-light.

    And FWIW, LA (or maybe CA?) is doing away with the Red Light Cameras that were installed all over the city. Their reason was that it cost too much to maintain and also, I believe, the false positives.
  14. wordoflife macrumors 604


    Jul 6, 2009
    \Basically there's a sensor before the line and after it, and it can detect when you cross it within a certain period.

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