Because they always have been red.
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.
red and blue
Locally to me, the blue bar on the top of the car flashes (in some other states, I believe police use red lights, or red and blue) the headlights flash and the tail lights flash.
Police lights in the UK are blue only, unlike in the USA where they are blue on one side of the car and red on the other.
You must obey the police officer over the other three. While red lights and stop signs indicate traffic rules that must be followed, a police officer directing traffic has the authority to override those signals for safety and order. Always prioritize the officer's instructions in such situations.
They are "Confirmation Lights" which are the WHITE or BLUE light located directly above a Traffic Signal and are utilised by the Police to detect "Red Light Runners".It is "lit" when the lights are on Red.This allows the Police to see if anyone has run the red light.
Typically, the strobes are blue and red.
Red and Blue for law enforcement vehicles.
Blue
When encountering flashing red lights, a driver should always stop.
You can only have red lights on the rear of your car. And blue lights are illegal to use on any car on the street they are only for emergency vehicles blue lights are for police only
Police lights are commonly referred to as "emergency lights" or "light bars." These lights are typically mounted on top of police vehicles and are used to signal the presence of law enforcement during emergencies or traffic stops. They often include red and blue colors, which are standard in many jurisdictions to indicate police activity.