客货分离整体式路基互通出口同分带开口长度研究

Opening Length of the Same Median Strip of Highway Interchange Exitwith Separation of Passenger and Truck

通过分析客货分离整体式路基互通出口同分带处的车辆行驶状态,提出等速偏移正弦曲线换道模型,并将同分带开口段分为前渐变段、等待段和后渐变段,建立了满足驾驶员行驶安全性与舒适性的客货分离整体式路基互通出口同分带开口长度计算模型。通过分析模型的相关参数,提出不同超高、不同设计速度下的同分带开口所需的最小长度建议值。以交通冲突率为安全性评价指标,构建VISSIM仿真模型,基于交通冲突评价模型(SSAM)对同分带开口长度建议值进行仿真验证。研究表明:根据冲突率模糊隶属度评价,开口长度大于或等于建议值时,道路水平为安全或较安全。模型计算合理,根据模型计算的同分带开口长度建议值具有可行性。

Through analyzing the driving state of the vehicle in the opening length of the same median strip of highway interchange exit with separation of passenger and truck,the constant velocity offset sinusoidal lane changing model was proposed.The open section of the same median strip was divided into the front transition section,the waiting segment and the back transition segment;and a calculation model for the same median strip of highway interchange exit with separation of passenger and truck was established to meet the requirements of driver s driving safety and comfort.By analyzing the relevant parameters of the proposed model,the recommended minimum values for the median strip opening length under different super-elevation and different design speed were proposed.The VISSIM simulation model was established by taking the traffic conflict rate as the safety evaluation index.Based on the traffic conflict evaluation model(SSAM),the recommended values of the opening length of the same median strip were simulated and verified.The results show that according to the fuzzy membership evaluation of conflict rate,when the opening length is greater than or equal to the recommended value,the road level is safe or safer.The model calculation is reasonable,and the recommended value of the opening length of the same median strip calculated by the proposed model is feasible.