Abstract: The opening of internal roads in residential areas can increase the density and accessibility of urban road network, and alleviate urban road congestion. In order to obtain a traffic assignment model suitable for an open community, a survey with questionnaire for travelers is conducted. It is found that the traveler mainly considers the two factors of travel time and time volatility. Based on this, the CONTRAM cost function is improved to obtain the generalized travel cost applicable to the opening of the community, which takes the influence of unblocked reliability on route choice into account. Combined with the traveler selection criterion after the opening of the community, the stochastic user optimal model (SUO)considering generalized travel cost is established, and the method of successive averages (MSA) algorithm is used to solve the model, so as to obtain more accurate traffic flow. Through investigation and analysis, suggestions for internal planning after the opening of the community are proposed from the aspects of cross-section of the open road, the radius and widening of the entrance and exit, and the traffic organization of the entrance and exit.

Key words: urban traffic, community opening, general travel cost, traffic distribution, community open planning, unblocked reliability

摘要： 开放小区内部道路可增加城市道路网的密度和可达性,从而达到缓解城市道路拥堵的目的。通过对出行者进行问卷调查,得知其路径选择行为主要考虑出行时间及时间波动性两方面因素,基于此对CONTRAM费用函数进行改进,得到适用于小区开放后的广义出行费用,该费用考虑了畅通可靠性对路径选择的影响;结合小区开放后出行者选择准则,建立考虑广义出行费用的随机用户最优模型(SUO),并采用逐次平均算法(MSA)进行求解,从而得到更为精确的路段交通流量;基于小区道路开放后需承担的交通量,结合城市道路规划相关规范,对横断面、出入口等方面提出开放小区内部道路规划的建议。

关键词: 城市交通, 小区开放, 广义出行费用, 交通分配, 小区开放对策, 畅通可靠性