|Signal Operating Traffic Cameras are Tricky|
Well, it appears there may be another factor at play – our lights when it is dark. As noted, the traffic cameras do not use infrared to detect vehicles in their zone of interest. They use visible light. As a result, as long as the sensitivity is set appropriately, they’ll detect a cyclist “in the zone” – at least during the day.
At night, it is another matter. I always figured that the headlight of a cyclist is plenty bright to trigger the signal, but then I started to encounter lights that would not change for me in the predawn darkness, but WOULD change during daylight hours. I tried taking my blinky headlight off and pointing it directly at the camera. No joy. What DID work was simply turning the blinky headlight on steady mode, and lighting up the flamethrower for extra effect before I rolled up to the intersection camera field of interest. I have not seen anything on the internet about the specific changing algorithm used by the cameras, but it appears they may depend on a light staying lit for longer than a cyclist’s blinky headlight, so that the lights are not triggered by extraneous brief flashes of light. I’d LOVE it if someone out there can verify this, but in the meantime, my suggestion is “make sure your headlight is on steady mode when coming up to a traffic signal activated by a camera. Stop a bit further back from the stop line than usual, because your headlight may not be high enough to be in the camera’s detection zone.” If you get bored, take the light off and point it at the camera; in steady mode. Certainly, this advice cannot hurt and may improve your ability to change traffic signals in the dark. I really DON’T like signals that won’t trigger for me!
|Do Traffic Signals Operated by Cameras Trigger Better for YOU When Your Lights are Steady and Not Blinking?|