Study on the minimum distance between three lane ramp continuous exits of stereoscopic structure highway

Abstract Under the design model of stereoscopic structure highway, conventional one-lane and two-lane ramps can no longer meet the traffic conversion requirements of interchange, so three-lane ramps should be designed in interchange. Due to the changing of design form, the existing single-lane and dual-lane design indicators cannot meet the design requirements of the three-lane ramp, especially in the continuous diversion area. Thus, according to the design requirements of the three-lane ramp in the stereoscopic structure highway, this paper discusses the distance between adjacent connecting parts when the main line and the ramp are continuously diverted. First, it analyzes the driving behavior on the continuous diversion section of the ramp. Then, based on the lane-changing theory, the formula of the vehicle lane-changing length, the driver’s recognition of the signs, the driving behavior are used to establish the models, which calculate the main line to the ramp diverging stage and ramp again diverging stage. After that, the recommended value of the minimum distance between consecutive exits at different ramp design speeds can be calculated. Finally, a 360 ° full view driving simulation platform is used to verify the rationality and applicability of the model from the aspects of driving trajectory, speed running characteristics and driver’s physiological index changes. The experimental results show that the value of the calculation model conforms to the driving habit, and all test drivers successfully completed the experiment, and the average driving distance in the experiment is less than the theoretical calculation value. Therefore, it can be considered that the theoretical model and relevant parameters established in this paper are reasonable and have certain engineering applicability.