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When the people drive, the driver behind some cars can not know or watch actually how much speed the infront car is kept. So when the infornt car stopped suddenly, the behind car hit the infront car. Sometime cause of this reason in the high way it cause big accident. This behind speed show the behind and other driver how much speed is kepted. So any other driver can drive more safe
Hanyang cyber university
Seoul, South Korea
Deagu, South Korea