隧道与互通式立交出口最小间距需求分析

Minimum spacing demand analysis between tunnel and exit of interchange

为确定高速公路隧道出口与互通式立交出口的最小需求间距,分析了隧道与互通式立交出口间距过近路段的交通事故特征,分别从隧道出口驾驶人的"明适应"、驾驶人对立交出口位置的识别、完整认读标志并操作的需要等方面,对需求距离进行了研究,提出了高速公路隧道与互通式立交出口保障安全需要的最小间距值。分析结果表明,在高速公路二级服务水平下,隧道出口与互通式立交出口的极限最小间距不宜小于600 m,一般值宜大于800 m。

In order to identify the minimum demand spacing between tunnel and exit of interchange on expressway, the traffic accident features on small spacing segments were analyzed. By studying the light adaptation distance, the ecognition distance to the exit, and traffic signs recognition and operation distance, the minimum spacing demand between tunnel and exit of interchange was put forward. Analysis result shows that the minimum demand spacing between tunnel and exit of interchange at least needs 600 m, the general demand spacing also needs 800 m under secondary level of service on expressway. 1 fig, 4 tabs, 13 refs.