以过村镇公路交通安全为出发点,借助于出入口管理技术,分别对交叉口功能区上游长度、下游长度进行了研究。在充分调查我国过村镇公路出入口间距的基础上,得到过村镇公路机动车的合理限速值为不应超过40km/h。 Starting from the traffic safety of the highway in the towns and villages, with the help of the entrance and exit management techniques, the upstream and downstream lengths of the functional area of ​​the intersection were studied respectively. On the basis of fully investigating the distance between the entrances and exits of the roads in our country, the reasonable speed limit for obtaining motor vehicles on the roads of villages and towns should not exceed 40km / h.