traffic congestion has long been a problem of great concern and complaint in big cities. it has caused a lot of inconvenience to people‘s life and work. for example, people have to set off well in advance to get to work on time and come back very late when their work is over.
there are many causes for this problem, but the following may be the most important ones. the first cause is the great increase in the number of private cars. cars take up more space but they carry fewer people. some private car drivers, ignoring traffic regulations, drive only for the sake of their own convenience, blocking the way of other public transportation vehicles. the second cause is the slow and inefficient construction and improvement of the roads and streets. with a large population and numbers of automobiles increasing, some roads still remain资源难易程度:★★★★★★★★★★★★★★★
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