改革开放以来,我国的道路运输业得到迅猛发展。截至1994年底,全国民用汽车已达1000万辆,其中营运汽车占60％左右。另外还有200余万辆的拖拉机参与道路运输,使得道路运输量占全社会总运输量的比重逐年提高。但在发展过程中,道路运输也面临一系列问题,阻碍其生产、技术水平的提高。其中的问题之一 Since the reform and opening up, China’s road transport industry has witnessed rapid development. By the end of 1994, the number of civilian vehicles in the country had reached 10 million, of which about 60% were operated automobiles. In addition there are more than 200 million tractors to participate in road transport, making the proportion of road traffic to total social transport increased year by year. However, in the process of development, road transport also faces a series of problems, which hinder its production and improvement of its technical level. One of the problems