Mumbai on the West coast of India is the financial capital of India. The City has grown phenomenally over the years with several suburbs and extended suburbs being added to it. The city is bustling with over 18 million people. Add to this the growing number of immigrants and the pressure on transportation systems. The city has one of the best public transport systems, with a network of suburban railways, public bus, auto rickshaws, taxis, radio cabs. But these do not meet the growing demand for travel. The city has to grapple with traffic congestion and health hazards from air pollution.