Abstract: In order to avoid the traffic disorder and safety accident caused by the short length of the highway common section, the construction of the highway common segment was analyzed and the influence factors of the minimum length of highway common segment were studied. The maximum length of interleaving area was determined by analyzing the configuration and the ratio of interleaving flow.Based on the most unfavorable driving conditions of drivers,the distance needed for safe lane change between common segments of highway was studied. The calculation method of waiting for insertable gap was established by using the theory of calculus, probability and traffic flow.By analyzing the maximum length of interleaving area and the safe lane change, the calculation model for calculating the minimum length of the highway common segment was established. Based on the number of lanes, the construction of common segment and the design speed, the recommended value of minimum length of common segment was proposed. The results show that with the increase of the design speed and the number of lanes,the length of the weaving area and the length required for lane change increase, and the minimum length of highway common segment is longer.

Key words: road engineering, highway, common segment, calculation model, minimum length

摘要： 为了避免因高速公路共用段长度设置过短而造成的交通紊乱和安全事故，对高速公路共用段构造的分析，探究了高速公路共用段最小长度的影响因素。分析共用段交织区的构型和交织流量比，确定了交织区的最大长度。基于驾驶员最不利行驶状况，研究高速公路共用路段之间的间距安全换道所需的距离。运用微积分、概率论和交通流理论创建了等待可插入间隙计算方法。通过对交织区最大长度和安全换道分析，建立了计算高速公路共用段最小长度的计算模型。提出了基于车道数、共用段构造和设计速度的高速公路共用段最小长度的建议值。研究结果表明：随着设计速度和车道数的增加，交织区长度和换道所需长度均增加，高速公路共用段最小长度越长。

关键词: 道路工程, 高速公路, 共用段, 计算模型, 最小长度