Abstract:

In order to improve the accuracy of the risk field model in predicting the lane-changing time of the driver in the weaving area of the freeway exit ramp, firstly, the driver behavior questionnaire survey method was used to cluster the driving style and lane-changing style, and the real vehicle driving test was carried out to obtain the vehicle lane-changing trajectory data and analyzed the risk perception level of different driving styles. Then, the derived traffic environment risk was introduced on the basis of the basic risk field model, and the risk field model was constructed from three aspects: road environment, traffic environment and management control, considering the factors such as driving style and traffic control. Finally, the vehicle lane change simulation control strategy and test were designed by combining the uniform acceleration (CA) motion model and the risk field model. The results show that the motor risk perception coefficients of cautious, ordinary and aggressive driving style drivers are 0.71, 1 and 1.17 respectively, and the distance risk perception coefficients are 0.62, 1 and 1.39 respectively. The risk intensity of driving style cautious type > ordinary type > aggressive type, and the critical lane change distance of driving style cautious type > ordinary type > aggressive type. The management control risk field model predicts that the threshold time of lane change decision for cautious, ordinary and aggressive drivers is 96.2 s, 105.2 s and 114.2 s, respectively, and the error is less than 1.5% compared with the simulation lane change time of 97.4 s, 104.8 s and 113.8 s.

Key words: freeway, exit ramp, weaving area, risk field model, driving style