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1、One possible version:

Traffic In The City

     With the development of economy, traffic is becoming one of the greatest problems of a modern city.

     One problem is pollution. The waste gases from the exhaust pipes are great enemies to the air. And there are so many cars and buses in the city that the harm they cause to the environment is considerable. Another problem is crowdedness. City inhabitants are so familiar with traffic jams that they are part of their lives. Time wasted on traffic and people are made impatient by the awful traffic. Worse than that, traffic accidents are real-life disasters of blood and death. Traffic has become one of the nightmares of people living in cities.

    To build highways and bridges only works out part of the problem. Cars and buses should be improved to give less waste gases. Government should encourage citizens to take buses so that there is less traffic on road. People should obey traffic rules and try not to make trouble on road. City area should be expanded so that there is more space for wider roads. Maybe low-pollution, high-efficiency means of traffic should be invented. Only after we pay enough attention to the problem will it be possible for us to solve it.