Nowadays, there are billions of vehicles in the streets. As most of them run by petrol, air and environment are being polluted. Also, these large numbers of cars makes long and long traffic jams. However, in order to solve this problem, people say that, the price of petrol should be increased. But I completely disagree with this solution. So, now I will try to show why I have a disagreement and I will give some other suggestions for those problems.