To my knowledge, if you cross the line, and the camera will
flash 2 times.... 1 time take your photo when you cross the 1st
line, and the 2nd time take photo of you crossing the line when you
are across the junction. If the camera only take you going over the
first and not the 2nd, they know you've stopped. Hope I'm
right!
By the way, if you kanna the camera, you surely won't miss the
bright flash lights! This is what others say! 