the number of private cars is on the rise in our country. some people thin k that private cars should be encouraged. others argue that private cars should not be encouraged. i think that too many private cars may create endless problem s though they bring much convenience and comfort. first, cars often produce air pollution and fill the cities with unbearabl e noises. second, most of the important cities in the world suffer from traffic congestion. in fact any advantage gained in comfort is often cancelled out in ci ty by the frustration caused by traffic jams, endless queues of cars crawling bu mpe r to bumper through all the main streets. third, to own a private car in china w ill not only cost you a fortune, but also bring you all kinds of trouble: gettin g a license plate, keeping the machine in good maintenance, finding a parking pl ace at night, etc. what is worse, cars are the main cause of traffic accidents. all over the world thousands upon thousands of people are killed or injured ever y year. traffic accidents caused by cars not only bring deaths and injury, but a lso make people suffer mentally and physically. in addition, our country has a v ery large population. if everyone had a car, all roads would be crowded with car s! therefore, i think the number of private cars should be limited. we should try t o find a safer means of transport that will bring joy and comfort rather than in jury and death.