Q. I sometimes see traffic lights on red, but with filter arrows for all possible directions set on green (well actually blue I suppose), what is the red light for?
A. The red signal does not mean that you are supposed to stop. It means that traffic coming in the opposite direction has a red light so you can make right and left turns (or go straight through) without having to worry about oncoming traffic. This system is also used in some Canadian cities. Answer kindly submitted by Raymond J. Smith and Mike Kuma
Is this right? Because I've wondered about this myself. Does that mean that in Japan sometimes you can have an arrow but not the right-of-way?