you really want a tip on how to observe traffic lights? when they are green Its save to pass the street, when they're red it's not safe. this ain't fucking rocket science.
but to be honest julien and frank have an iphone app called "traffic light timer", they can rely on. no need do think five minutes and check the traffic before you bomb a hill anymore. other than that i'd suggest you a invisible shield, but they are expensive.
people these days...