【急】英语作文稿!帮我检查下有没有语法错误,并纠正,

题目

【急】英语作文稿!帮我检查下有没有语法错误,并纠正,
Harbin's traffic problems are serious.
First of all,there are traffic jams.with the development of economy,most families can afford to buy cars.But when you are enjoying the freedom of selfdriving,the road is more and more crowded.Suddenly,you wouldn't be enjoyable anymore because you found yourself have been stuck in a traffic jam.Second,the road is not flat.Bad roads do harms to your car and you couldn't come to a sudden stop in bad weather.Third,some people disobey traffic rules.This kind of behaviour is the most dangerous and usually causes traffic accidents.On the other hand,the subway engineering project of Harbin is under construction.It will make roads less congested.In a word,we should make every effort to solve our traffic problems.As a student,what we can do is to follow traffic rules.Otherwise like walking or riding to school also helps.Let's make a contribution to improving Harbin's traffic.In this way,we'll live a safer(safe?) life.

答案

语法没啥问题 最后一个用safer是对的 强调improving前后对比嘛
另外,个人觉得楼主着重强调私家车导致交通堵塞,路况和违反交通规则等问题一带而过 从第一句的are serious来看显得有点头重脚轻
不过楼主的句型和条例很清晰.
就这些了.
^^