一、概况美国的公路构造标准,系根据该国的公路交通量手册、城市间公路几何构造指针和市内道路几何构造指针予以决定的。州际公路是美国最重要的公路网,全部设有多条车道、控制出入、分向行驶、并在各车道间设有分隔设施。州际公路建于交通量大的地区,除个别路段、长大桥梁和海底 I. Overview The U.S. highway construction standards are determined according to the country’s road traffic manuals, the guidelines for the geometric construction of inter-city roads, and the pointers to the geometric structure of the urban roads. Interstate is the most important road network in the United States, all with multiple lanes, controlled access, directional driving, and separate facilities in each lane. Interstate is built in large traffic areas, except for individual sections, bridges and seabed