it depends on the country in which your living!
Chicago is famous for having only Blue lights on its police cars
Typically, the strobes are blue and red.
Blue
Emergency lights in state police cars in Indiana are blue and red in most counties in Indiana. These are common colours, not just in Indiana, but throughout the United States and the world!
Police lights are the red and blue lights that use in an emergency. It was invented by a Superintendent of Signals for the Police Department of Detroit in 1920.
At this time there really is not much legal requirements relating to the use of yellow recovery lights. You would not be able to use the same color of the police or fire department recovery lights.
The current Police Chief for Toledo, Ohio is Chief Michael Navarre.
Police sirens
Police should not speed if there not chasing anyone or if there lights are not on or there sirens are not on
A police car can generally follow you anywhere you can drive, warning lights on or otherwise.
There are many places that you can purchase police strobe lights. Many of them have different styles that you can choose from. Amazon and Speed Tech Lights are just a couple of places you can find these lights.