There's a lot of flashing lights on the top of police cars, most meaning you're about to get some kind of ticket, but yellow ...

So you were watching a Fast and Furious movie the other day and wondered why all the race cars had lights glowing from ...

But it all makes sense at night when the cars are lit up brightly, sometimes flashing in various colors. Though festive, Scottsdale police warn that having the lights on your vehicle violates the law.