I agree that strict measure is needed by govt to restrict vehicles on roads which would reduce traffic jams and pollution. As I mentioned example of China above (which I am not sure), but I surely know that London has congestion tax which every vehicle has to pay if it has to enter certian areas of city. Some people prefer to pay tax and enter with their vehicle, some can park their vehicles outside that area and travel inside city by public transport. Park-and-Ride facility is provided for such people who don't want to enter city with their vehicles. But all this is possible because London has very good public transport. I doubt if any of Indian city has efficient public transport which can accomodate population traveling daily.