Motor gangsters is the group of the boy who would like to drive on moterbike at night time on the road and make the noise to bother another people. Their age is about 13- 25 years old. They waste their time by fun on the road and maybe race, but it is not safe for them and other people who use the road because it is not road for recing but it is road for everyone. They don’t like to wear helmet and never careful. They think as they will cool if they can show what other people can not do. Their motorcycle had change the intake to make more noisy. And this is a part of accident on road in Thailand.