in many cities, traffic is overcrowded in the rush hours. cars running on roads may even move more slowly than people walking on sidewalks, due to the heavy traffic people have to spend more time on their way home or to work and even might be involved in an accident sometimes.

　　in recent years, with the growth of family incomet more and more people are able to afford private cars, but the roads are as narrow as ever. what's more, the population increases too quickly, while the building of cities is too slow. this contradiction results in the traffic congestion.

　　the government attaches great importance to the probiems. it has made great efforts to control the population inerease, widen the roads and solve the traffic problems.