Using the fuzzy evaluation method to select the sectional shape of arc、parabolic、sinusoidal and trapezoidal speed control devices as decision-making objects and select the visual eye-catching degree, sense of danger and the expected value of discomfort as evaluation indexes. Studying the influences of the sectional shape of speed control devices on three evaluation indexes. Establishing a quantitative description model of the driver's cognition of the sectional shape of the speed control device. In the arc、parabolic、sinusoidal and trapezoidal speed control devices, though the fuzzy evaluation method we can see that the visual eye-catching degree of the trapezoidal device is the largest, and the sense of danger and the expected value of discomfort are the highest . The results show that the trapezoidal device is the best design scheme for the sectional shape of the speed control devices, that is to say trapezoidal device has the best speed control effect.

CICTP