美国州际高速公路设计标准美国州际高速公路设计标准，是基于研究当时公路的缺．点，国防武器运输的需要以及和平时期交通流量而定。美国州立公路委员会提出每条州际高速公路设计的远景规划是２０年，按设计年份的第３０个高峰小时交通量为准。委员会的设计标准包括三种行... American Interstate Freeway Design Standard The American Interstate Freeway Design Standard is based on a study of the lack of highways at the time. Points, the need for the transport of national defense weapons and traffic flow during peacetime. The U.S. State Highway Commission proposes a long-term plan for each of the interstate freeway designs that is 20 years old, based on the 30th peak hour traffic volume of the design year. Commission’s design standards include three kinds of lines ...