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Traffic congestion has always been a problem of great concern and complaint in big cities. Some major roads are regularly blocked with traffic in rush hours. It has caused a lot of inconvenience to people’s life and work. There are many reasons for it.First of all,...Secondly,...Thirdly,... The first cause is the great increase in the number of private cars. People should obey the traffic rules. Road conditions should be improved. Only when the problem of heavy traffic is solved can we have a happier life.