Retro-reflector, usually referred to as reflective film, reflector. Commonly used in the steam locomotive sides, rear, front, and walking pedestrian reflectors, etc.
   The retro-reflector which is obtained by using light refraction principle, the steam locomotive headlights direct light directed into the retro-reflector, to direct the light through the multi-refraction, and the optical axis at an angle of 20 "and a 1 ° 30" is emitted. So sitting in the cab car driver can see refracted back from the reflector in the light, and take appropriate measures to slow down or avoid. 20 "observation angle is ECE / SAE / CCC regulations made ​​for the perspective of a car driver's provisions .1 ° 30" observers are regulations for Kabbah car driver's perspective to make regulations.
   Retro-reflector according to where it uses a different, and have different classifications and color-coded:
A, installed in front of the reflector body, according to SAE / ECE / JIS / CCC GB11564: the provisions of Article 4.4 2008 regulations, the color must be white; their reflective luminosity value is four times after the red reflector.
B, mounted on the side of the body, usually we call side reflector. According to regulations, the side retro-reflector must be amber. Its luminosity is 2.5 times the value of reflective red after the reflector.
C, installed in the rear of the reflector body, we usually call back reflector / tail reflector. Regulations must be red. Its reflective CIL values ​​can reference GB11564: 2008 regulations 4.4.1.1 shall table a description of Article 4.4.
Safety Class D, pedestrians using retro-reflector is often called "walking reflector." It is the world's cheapest and most effective life insurance. Wear a walking pedestrian reflectors, safety factor at night walking the walk than not wearing a reflector increase 18-fold. The reason is that pedestrians wearing reflectors can walk under the irradiation of automotive lighting, local advance nearly 100 meters from the outer body allows car drivers to see. Thereby ensuring that the driver has a far enough distance deceleration avoidance.
Walking reflectors usually require safety certification, in order to ensure that their products are reflective and safety. Walking reflector of the reflective material commonly used PMMA, AS, PC. The reason is that these three materials are very good translucent to PMMA optimal.

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