In NY "light bars" are regulated. If you put a red or blue flashing light bar on top of your car you can get a ticket. OTOH, anyone can put a yellow flashing bar on top of their car ( around here they are called "Whoo hooo" bars and generally used for safety vehicles and volunteer firefighters ). Personally I'm with the above posters that they should either standardize with some other area or leave flashing/steady up to the user to decide. Either way it's useless to pass another law unless they actually intend to enforce it.