Nowadays， it is generally acknowledged that the automobiles make our life convenient. Some argue that they play an essential role in our modern life and we can not live well without automobiles. People drive their cars to go to work which saves more time and energy.

But some other people believe that a great many of problems can be brought by the automobiles. First of all， much tail gas released by cars harm pollutes the fresh air gravely. Secondly， too many cars result the roads in blocked. Finally， fast driving makes people crazy， which can account for so many traffic accidents.

As far as I concerned， it is no doubt that vehicles contribute to our economic development exceedingly. But if we overuse it， many undesirable consequences can be surely caused， which contains highway accidents， air pollution and so on. So at this moment， we must take measures to avoid these happen.