(一)国外货运专用汽车的发展概况。国际上汽车运输的发展趋势之一,是大量采用各种专用车辆。因为采用专用车辆能大大节省装卸时间,减少运输过程中货物损耗。因而提高了运输生产率,降低运输成本。据统计,美国总重9～11.8吨的中型载货汽车,保有量中专用汽车占三分之二以上。其分布情况如表1所示: (A) Overview of the development of foreign cargo vehicles. One of the trends in the development of international motor transport is the extensive use of various special vehicles. Because the use of special vehicles can greatly save loading and unloading time, reduce the loss of goods during transport. As a result, transport productivity is increased and transportation costs are reduced. According to statistics, medium-sized trucks with a total weight of 9 to 11.8 tons in the United States account for more than two thirds of the total amount of special purpose vehicles. Its distribution as shown in Table 1: