公路通行能力与横断面尺寸是影响公路建设成本的关键性指标,而山区公路通行能力指标一直是我国公路标准规范体系中的一项空白。在我国西部地区各省份在建和规划建设的国、省干线公路中,山区双车道公路占据80%以上。因此,科学合理的山区公路通行能力指标体系,可以为西部公路建设 Highway capacity and cross-sectional size are the key indicators affecting the cost of highway construction, while the indicators of highway capacity in mountainous areas have always been a blank in the highway standardization system in China. In the western provinces and autonomous regions under construction and planning and construction of national and provincial trunk roads, mountainous dual-lane highways account for more than 80%. Therefore, the index system of scientific and reasonable mountain highway capacity can provide a good example for western highway construction