基于车道变换的立交最小净距模型

Interchange minimum spacing model based on the lane changing

为了充分发挥城市外环路对不同车流对象的服务功能,解决两互通式立交之间因间距不够引起的各种交通问题,建立了两独立互通式立交之间的最小净距模型。分析了驾驶人对道路交通信息的发现、识别、分析、判断等心理、生理反应过程,建立了驾驶人车道变换模型,根据调查资料得出运行速度与驾驶人变道转角之间的回归关系,分析了驾驶人在寻找可接受间隙期间行驶的距离,得出了两互通式立交净距的关系模型,并结合深圳外环高速公路进行了实例分析。研究结果表明：距离较近的两互通立交之间宜适当减少非必要道路交通标志的设置;双向6车道设计速度分别为100km/h和80km/h时,互通立交之间的净距不宜小于1 410m和880m;大型车比例较高或交通组织混合严重的互通式立交最小净距宜适当增加180~200m。

The minimum spacing model between two independent interchanges was built in order to play the service function of different traffic objects sufficiently on urban external loop expressway and resolve the traffic problems caused by inadequate spacing between two independent interchanges. The driver＇s psychological and physiological reaction process to the identification, analysis, and judgement of road traffic information were analyzed and the model of driver lane changing was built. The regression relationship between running speed and lane changing steering angle was obtained from survey data, and the driving distance during the period of searching for an acceptable gap was analyzed. The relation schema of the spacing between two independent interchanges was obtained. Combined with the SJ1 contract segment on Shenzhen external loop expressway, this paper carried on instance analysis. The results indicate that non- essential road traffic signs between two closer interchanges should be decreased appropriately; when the design speed for six-lane two-way are 100 km/h and 80 kin/h, the spacing between two independent interchanges should not less than 1 410 m and 880 m as to the interchanges with higher proportion of large vehicles or severely mixed traffic, the minimum spacing should be increased 180-200 m. 4 tabs, 7 figs, 16 refs.