Traffic jam (to be) is a common sight in big cities like Delhi, Mumbai, Calcutta etc. This is due to (increase) increasing population of the metropolitan cities. People from far off places rush towards big cities to (earn) earn as big cities (have) have many options and possibilities for them. Then there are permanent citizens also. So with the human traffic, vehicular traffic also increases. As the standard of living is (become) becoming high everyone wants to (purchase) purchase his own car.