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Since you guys are arguing over something you have no idea how it functions.
The redlight photo enfocement system gets a signal of the "yellow" and then the "red", it also has sensors to detect motion before the violation line (crosswalk or stop bar). This can be inductive loop sensors (the round things in the road) or a radar system.
IF there is motion AND the signal is yellow and is about to turn red the motion will be captured. However the systems are designed to show the rear of the car with the redlight visible and the car clearly traveling over the violation line.
It doesn't take constant video, AND portland hasn't changed from Still film to Video yet so currently it takes two pictures, one face shot IN the intersection and one rear shot showing you cross the violation bar with the light red.
posted 3 years, 8 months ago
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