Abstract: In order to quantitatively analyze the effectiveness of the linear guidance of the reflective rings for the small radius circular curve section of expressway tunnels,firstly,indoor simulation tests were realized on the psychological software platform of E-prime,and the accuracy rate of curve judgment and judgment time were selected as the evaluation indexes of the driver's curvature perception ability.Twenty testees were put through the experiment to obtain test data.Finally,test data on the testees under different scene conditions were statistically analyzed.The results show that when the number of reflective rings is less than three,the accuracy rate of curve judgment is significantly positively correlated with the number of reflective rings,and there is a significant negative correlation between judgment time and the number of reflective rings,that when the number of reflective rings is more than three,accuracy rate of curve judgment is no longer significantly positively correlated with the number of reflective rings,and the judgment time is not greatly reduced,and that compared with the tunnel driver's field of vision in the program with four chevron alignment sign,the use of three reflective rings in tunnels allows the driver to be capable of making a more accurate judgment of expressway tunnel's line in the small radius circular curve section more quickly.

Key words: expressway tunnel, small radius circular curve section, reflective ring, accuracy rate of curve judgment, judgment time