Retro-reflector in the optical field called reverse reflector (Retroreflector). Its characteristics are in a certain range of incident angles, the reflected light is substantially in the opposite direction of the incident light and the return was a certain divergence angle. Therefore, it is widely used in industrial automation, instrumentation, navigation and transport equipment and other fields. In the transportation equipment, versatile, large amount: There outline standard bicycle reflectors, roads, bridges, and other protruding signs. These reflectors are motor vehicles (especially cars) driver understand traffic driving at night, safe driving and settings. Two cars on the road situation is shown. Front of the vehicle headlamp in the light irradiation retroreflective road flag, the driver will see that the status of its backlight road. Car headlights negative light on the front part of the car taillights retro-reflector, the driver can still be retro-reflector according to the inverse of the reflected light in front of cars with understanding, especially on the highway, the retro-reflector setting is particularly important.

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