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.
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