Abstract: Access spacing has a great influence on traffic safety and traffic capacity of suburban highway. Through the survey on the suburban highway, the definition of the access spacing was put forward on the basis of the data such as the running speed and traffic volume in the field. Based on the collected data, the model was established by the maximum entropy principle. MATLAB software was used to solve the equation, and the reasonable spacing of suburban highway access was determined. Taking the delay, the number of parking and the average speed as the evaluation index, the distance between different access ports was simulated and checked by the simulation software Synchro, which provided a new way to solve the problem of traffic safety.

Key words: road engineering, maximum entropy, suburban highways, access spacing, simulation

摘要： 接入口间距对城郊公路的交通安全和通行能力有着较大的影响。通过对城郊公路进行调研，实地采集运行速度、交通量等数据的基础上，提出了接 入口间距的定义，把采集数据利用最大熵原理构建模型，运用MATLAB软件求解方程，确定了城郊公路接入口合理间距。并使用仿真软件Synchro以延误、 停车次数、平均速度作为评价指标对不同接入口间距进行仿真验算，为解决交通安全问题提出了一种新思路。

关键词: 道路工程, 最大熵, 城郊公路, 接入口间距, 仿真