Auto Rickshaws are the most common way of travel in India. These three wheeled, open vehicles without any doors or windows are the most enjoyable for local travels. Though you would hate to travel in these in heavy traffic, they are the cheapest mode of transportation in India. Most of the times, rickshaws are driven zig-zag on the road as Mumbai is loaded with traffic everywhere. It is amazing to see how they can fit into small spaces and are also fast enough for a good ride.
Below is a picture of a Rickshaw trying to get into a lane during traffic.