One thing to keep in mind about the law. It is not just a question of whether or not the police will enforce the law but also a question of your liability if you are in an accident. If you get hit by a car while you are using a flashing light on your bicycle and that is illegal in your jurisdiction you run the risk that some lawyer will use this as an excuse to find you are at fault. The lawyer will claim his client was confused by the bicycle who was riding with illegal equipment. This is why I got the law changed here in Hawaii to permit (but not require) bicycles to ride on the shoulder. No policeman ever ticketed a bicyclist for doing so but it could have been used against the cyclist if there was an accident. Same is true of a lot of laws. If you signal a right turn with your right arm instead of you raised left arm and get hit what will the lawyers say - you were improperly signaling your turn ... an so forth. You may say, well safety first, I'm going to use my strobe blinkie no matter what the law says because it makes me more visible. Well, hope you don't get hit, but if you will notice the number of threads where the moving Christmas trees got hit anyway it should be obvious the strategy doesn't always work. This is why it is a good idea to get the law changed even if the police are not ticketing for it.