Traffic signs are the guide of the road transportation. They are the main body which delivers road information to transportation participants. The quality of signs comprehension has influence on driving safety. The article will analyze the process of drivers perception signs based on drivers' psychology perception and build a process model on drivers processing information. It studies the influences of the factors based on psychology perception .The factors include signs physical characteristics, angle of view ,quantity of signs information, mental characteristics of drivers, physiology characteristics of drivers. It builds theoretical foundation for later research on evaluation index of signs setting. We hope to reduce the bad influence of the factors on signs perception and raise the safety level of driving.
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