Mumbai is the city which is most car congested. The density of private car rose around 18%in just two years.
Presently around 500 cars are there for every kilometre of road.

Pune has             359 cars/ km
Kolkata has        319 cars/ km
Chennai has       297 cars / km
Bangalore has   149 cars/ km
Delhi has            108 cars / km

Private vehicles are the impediment in the growth of public transportation. And it becomes difficult to drive in such a city.

But it is also, people are generally not satisfied with public transportation, therefore they are forced to buy their own vehicle.