Are the red and blue flashing lights on the roadside for speed testing?

[RebeccaLynn]

Roadside red and blue flashing lights are not for speed testing. Below is extended information about the functions of red and blue flashing lights: 1. Warning function: The red and blue lights on highways serve as warnings, marking areas ahead as accident-prone or indicating poor current driving conditions, reminding drivers to pay attention to safety and drive carefully. The reason red and blue lights are used for road warnings is that red is a primary color in the warm color spectrum with strong penetration power, making it effective for warnings. 2. Deterrent function: The police lights and sirens used on official police vehicles are intended to alert pedestrians to yield the right of way, facilitating police actions. At the same time, they also serve to deter criminals.