Originally Posted by
njkayaker
It doesn't seem flashing front or rear lights bother cops. I think the legality is moot.
Just don't use blue lights. Cops are very protective of their exclusive use of blue lights and that will get you pulled over. No purple either, it looks blue to many colorblind people. I would only use red on the back. Drivers expect red lights to be on the back, you don't want them to think your riding away from them, when you are going towards them.