【答案解析】[参考范文]

After reform and opening-up, Chinese economy is developing with extreme speed. People"s material life has changed noticeably as well. Although we are proud of these alterations, new issues are appearing ceaselessly in front of us. One of them is traffic accident that is also the problem about which ordinary people are concerned.
Why are traffic accidents so serious? In the first place, I"ll discuss the current traffic status. On the street, we often see that people who ride bicycles run to the center of street, taxi drives on the bus" route. Both vehicles and individuals want to lead up so that nobody can move. It is obvious to all that hidden troubles of safety exist in it. In the second place, the traffic laws aren"t enforced sufficiently so that people ignore the traffic laws that are also the direct reasons of traffic accidents.
In conclusion, it is high time that we attach great importance to traffic accident. In order to reduce it, it is necessary for all of us to make efforts to improve it. If so, I"m convinced that before long people would live in happiness and safety.