Due to the limitations of the relationship between human behavior and the driver, the vehicle and the road between the environment so that the above process is very complicated. When the installation of solar traffic sign, should also consider the expected value of the driver's reaction time and short-term memory and other features. Only fully consider the behavioral characteristics of road users, road traffic signs set only has validity.
Under this section is "not familiar with the surrounding road network system of road user" does not mean that the ring road around the altar without users' knowledge, but rather by means of maps or other inquiries, on the route to the destination and via some understanding and guidelines rib smooth traffic signs arrival.
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