Eliminating trips altogether, working from home more often, or combining trips (called trip chaining) were the most common ways of reducing vehicle miles of travel.
Public transit accounted for about 2.5% of the decline in vehicle miles of travel nationally in the third quarter of 2008, which went down by 35.5 billion miles compared to the same time period in 2007. Alarge percentage increase in public transit ridership would therefore not take a large percent of people off the road or out of their cars.