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为研究接入口间距对城郊公路的道路通行能力和交通安全状况的影响,通过实地调研,大量采集城郊公路的车辆运行速度、交通量等数据,据此提出接入口间距的定义,并依据最大熵原理构建模型。运用Matlab软件计算出模型最优解,进而确定城郊公路接入口安全间距为120~140 m。然后用仿真软件Synchro,对不同接入口间距进行仿真。结果表明,随着接入口间距增大,车均延误、停车次数不断减小,平均车速不断增大;当接入口间距大于120 m时,3个指标趋于稳定。最后,以太原城郊公路小牛线为例,验证该接入口安全间距值能满足通行能力和安全视距的要求。
In order to study the influence of access spacing on the road capacity and traffic safety of suburban roads, a lot of data such as vehicle running speed and traffic volume of suburban roads were collected through on-the-spot investigation. Based on this, the definition of entrance clearance was proposed and the maximum entropy Principle building model. Using Matlab software to calculate the optimal solution of the model, and then determine the safe distance between the entrance of suburban roads is 120 ~ 140 m. And then use the simulation software Synchro, simulation of different access port spacing. The results show that with the increase of the distance between entrances, the vehicles are delayed, the number of stops is decreasing and the average speed is increasing. When the distance between entrances is more than 120 m, the three indexes tend to be stable. Finally, taking the Taiyuan suburban highway calf as an example, it is verified that the value of the safe clearance of the access port can meet the requirements of traffic capacity and safety line of sight.