Traffic sign manages in traffic and is main effect in traffic safety. Traffic sign sort is various, but past is to use face of card of common paint spray mostly, nightly indication effect is poorer, prevent traffic accident effectively hard. Now, face of card of foreign traffic sign was used generally already directional glance material. Have the aid of of this kind of mark is shot at car lamp illumination, make the driver is in the hundreds pattern that face of clear shop sign can see go up besides rice, be helpful for safe drive a vehicle greatly. In addition, glance the police uniform, glance segregation is taken, glance guide, glance graticule, glance the establishment such as number plate also is being popularized use. The article only directional glance structure and the fundamental of material, breed make following brief introduction

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