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近十多年来,无论是发达国家还是发展中国家,都毫不例外地不同程度地受到交通问题的困扰。据美国有关部门预测,到2020年,因交通问题而造成的损失每年将超过1500亿美元。解决交通问题最直接的方法就是提高路网的通过能力,但由于一方面可供修建道路的空间越来越小,另一方面无论是哪个国家都不同程度地受资金短缺的困扰。同时,人们越来越多地从保护环境、节约能源的角度来考虑问题,再加上近20年来,计算机技术、通讯技术、信息技术的飞速发展,
In the past decade or so, both developed and developing countries have been plagued by traffic problems to varying degrees without exception. According to the forecast of relevant departments of the United States, by 2020, the losses caused by traffic problems will exceed 150 billion U.S. dollars each year. The most direct way to solve the traffic problem is to increase the capacity of the road network. However, on the one hand, the space available for road construction is getting smaller and smaller. On the other hand, no country is plagued by a shortage of funds to varying degrees. At the same time, more and more people are considering issues from the perspective of protecting the environment and saving energy. Coupled with the rapid development of computer technology, communication technology and information technology in the past 20 years,