just keep in mind that it doesn't mean that someone beat the red light if the camera's at a trffic signal flashes. it does also flashes if someone is over the speed limit specifically those newly installed ones.

i for one have experienced this (thrice already) while going to villagio mall. another car was travelling way above the speed limit and the camera at the traffic signal did flash even if it's on a green light. so i came to conclusion that the newly installed cammeras at the traffic signal do also measures speed of the vehicles passing by. so if you know you're within the speed limit and you did not beat the red light, that only means your safe :)