论文部分内容阅读
美国现有的国家高速公路体系于四十年代开始筹划,八十年代初主体工程基本完成,九十年代后进入系统养护和高质量管理阶段。美国公路由州际公路、国家公路、州内公路和市内主干线四大部分组成。1993年总长度为619万公里,1993年全美交通货运开支总额为3590亿美元,其中高速公路年货运开支为2780亿美元,占整个交通年开支的36.9%,位居榜首。位居第二的铁路货运开支只有近300亿美元,高速公路客运开支的比重更大,达5082亿美元,占整个交通开支的
The existing national highway system in the United States started its planning in the 1940s. The main works of the early 1980s were basically completed and entered the stage of system maintenance and high-quality management after the 1990s. The U.S. highways are made up of four main parts, namely, interstates, national highways and intra-state highways and the main trunk lines of the city. In 1993, the total length was 6,190,000 kilometers. In 1993, the total expenditure on transportation by the United States was 359 billion U.S. dollars, of which the annual freight transportation expenditure on expressways was 278 billion U.S. dollars, accounting for 36.9% of the annual transportation expenditure, ranking the first place. The second largest rail freight expenditure was only about 30 billion U.S. dollars. The proportion of expressway passenger spending was even larger, reaching 508.2 billion U.S. dollars, accounting for the entire transportation expenditure