城市快速路入口-出口最小间距分析

摘要:

城市快速路进出口多选用先进后出的形式，而“入口-出口”的规范要求最小间距最大，在实际设计过程中常出现不满足规范值的要求。本文对“入口-出口”间距进行分析，其由变速车道长度、交织长度和安全距离组成，分别对加减速车道、过渡段长度、交织长度、安全距离进行计算，得出“入口-出口”的最小间距，给出相对合适的最小间距要求。对于不同间距的条件下，提出相应的处理措施。

Abstract:

Entrance and exit of urban expressways are mostly in the form of "first-in, last-out". According to the specification, the distance of entrance and exit is the largest. But this distance often does not meet the requirements of the specification in the design process. The article analyzes the distance of entrance and exit, which is composed of speed-change lanes, weaving section and safety distance. The length of acceleration lane, deceleration lane, transition section, weaving and safety distance are calculated separately. In this way, the minimum distance of entrance and exit can be obtained and the recommended values of minimum distance are given. Under the condition of less than the minimum distance, the corresponding treatment measures are put forward.