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概 况 1974年美国拥有公路614万公里,其中有高速公路近6.4万公里。公路密度按国土面积计,每平方公里有0.66公里。在公路总里程中,铺筑路面率达80％。 1974年美国拥有汽车近1.3亿辆,按人口计,平均1.6人拥有汽车一辆。在这些汽车中,有载货汽车2,470万辆,大客车44万余辆,分别完成长途货运周转量7,225亿吨公里(短途货运几乎全由汽车承担,但无统计资料),客运周转量19,300亿人公里。营运企业的主要技术经济指标如下:1975年产值在1千万美
Overview In 1974, the United States owned 6.14 million kilometers of highways, of which nearly 64,000 kilometers were highways. Road density by land area, 0.66 kilometers per square kilometer. In the total length of the road, the pavement rate of 80%. In 1974, the United States owned nearly 130 million cars, with an average of 1.6 people owning a car by population. Among these vehicles, there were 24.7 million trucks and more than 440,000 buses, achieving a turnover of 722.5 billion tons of long-haul freight (short-haul freight is almost entirely borne by the car, but no statistics are available), and passenger traffic volume was 1.93 trillion Km. The main technical and economic indexes of the operating enterprises are as follows: The output value in 1975 was 10 million U.S. dollars