When police cars are patrolling on the road, in order to ensure safety and visibility, red and blue light bars and siren speakers are often installed on the vehicles to visually and audibly alert people to the arrival of police cars. This reminds pedestrians and vehicles on the road to avoid police cars in time.

The red and blue light bar is usually installed on the roof of the car, usually with magnet mounting or gutter mount. This lightbar can be matched to the corresponding size according to the width of the car. The most common lightbar is 48 inches in length. Careful observation shows that the lightbar is composed of many independent lights, which are controlled by the overall PCB board installed inside the long row of lights. The most common colors on police cars are red and blue, with police cars in Europe often equipped with blue. Of course, construction vehicles are often equipped with yellow and white lights.

Why do police cars have red and blue lights?
Because the red and blue lights are very bright, and the long row of lights can switch up to more than 20 flash patterns, they can be seen from a long distance.

The function of red and blue light bar is very important, and the appearance design is also very important.
Anti-vibration: Since the vehicle will constantly vibrate when the road is bumpy during driving, the selection of the mounting bracket is very important.
Resistance to extreme temperatures: Normally, LED lightbar can withstand -30℃-+70℃.
Corrosion resistance: In many areas, acid rain occurs due to air pollution, so the material of the long lamp housing is very important, and is generally composed of UV-resistant PC and aluminum alloy.