Why are the blue lights on Passengers side and red on Drivers side?
It is so that the driver being pursued (the soon-to-be-a-ticket-recipient :-)) can better see it in his/her rear-view or side-view mirror. People are conditioned to stop for a red light. This is the most efficient way to signal the driver of a car in front of Mama’s car to stop. The LA police dept (which has to handle huge traffic safety and other crimes) uses an amber light on the rear of Mama’s car which is activated by an on-off switch. We are also conditioned to think of a yellow light as a caution light. In this case, cars behind the police vehicle are being cautioned by the amber lights to slow down because police activity is taking place!