In recent years, with the guidance of the national transportation industry policy, the traffic mileage of various regions is showing a high growth momentum, at the same time, people pay more attention to the highway traffic safety situation. At this present, the most important things of the highway traffic safety are improving the level of the highway traffic safety and reducing the accident rate. In the highway traffic system, the transportation safety is eminently influenced and restricted by the factors of the road, especially the linear combination of highway, it directly influences the highway traffic safety situation.%近年来，在国家交通运输产业政策的引导下，各地公路通车里程都呈现出较高的增长态势，与此同时公路交通的安全状况也逐步引起了人们更多的关注。当前，提高公路交通安全水平，降低事故率成为公路交通安全的首要问题。在公路交通系统中，交通安全受“路”因素的影响和制约较突出，尤其是公路的线形组合，直接影响着公路交通的安全状况。
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