According to American Public Transportation Association's most recent Transit Saving Report, a two-person household can save, on the average, more than $10,000 a year by downsizing to one car.
Each car taken off the road also helps reduce traffic congestion.(http://3.bp.blogspot.com/_IuK6PvWxEYY/RniDakvOGUI/AAAAAAAAAQU/OxldG9H2QhA/s400/305193596)
IS THIS TRIP REALLY NECESSARY?
By simply planning ahead, we can reduce the number of trips we make each week. For example, by planning our meals on a two week basis, and by avoiding running around to several stores to do our grocery shopping we can cut back on the trips we make.
By banking on line, we can avoid running around paying bills.
These are but two ways that we can do our part in reducing road congestion, and I'm sure others can come up with more ways.