Evaluation Indexes of Layout Combination of Signs and Markings in Highway Horizontal Curve

Abstract:

Based on driving simulation data, combined with drivers’ characteristics in highway horizontal curve of operation speed characteristics, steering characteristics and driving track features, speed, steering wheel angle coefficient and lane position were chose to construct rationality evaluation indexes and effectiveness evaluation indexes for layout combination of signs and markings in highway horizontal curve. Among them, rationality evaluation included steering position evaluation and driving workload evaluation. Wavelet decomposition method was used to decompose steering wheel angle coefficient into multilayers. Then starting/ending turning position and high frequency energy were obtained. So steering position evaluation was conducted through the distance between starting/ending turning position to point of tangent to spiral/ point of spiral to tangent. Driving workload evaluation was carried out through high frequency energy ratio. Effectiveness evaluation included speed control effectiveness and lane position control effectiveness. Speed control effectiveness evaluated by average speed, operation speed and speed deviation while lane position control effectiveness evaluated by average lane changing times and average distance of rolling on markings. Through the application example, the necessity of researching on layout of signs and marking and the validity of evaluation indexes was verified.