Traffic Camera taking use image senor system, it is when
your whole car is expose to the sensor by more than 1/2 of it
size, the camera snap twice, you notice 2 stands on any
traffic junction camera, one is the sensor detector, another
one is the camera, once the senor detector an image crossing the
camera will snap with a huge thunder bolt flash.
Why some people are able to get away is because
1. the image senor only detect less than 1/2 the size of the
vehicle, so presume it could be person or some other object, this
happen when the vehicle is travelling out of the sensor zone, that
why you must know where the sensor focus on.
2. the flash, some camera, for months had never taken any
picture, maybe due to careful driver on that stretch of road, so
the flash did not work to the camera shutte speed resulting in dark
picture, it takes a few secs to warm up the bulbs, if you are
photographer you will know that camera first shot is alway dark due
to delay in flash, that is why they use to play a few shot first
before really go into photoshoot.
3. Big junction, for example the one at
lavender and kallang, the focus of the sensor will be
only at one place, so sometime even if you beat the red light,
camera flashed, you still do not get summon, but I bet you go play
with it.