Car Free Day is an international event celebrated every September 22nd in which people are encouraged to get around without their car - highlighting transit, bicycling, walking and all alternative modes of transportation. By taking a fair number of cars off the roads people who live and work there are given a chance to consider how their neighborhood might look and work with a lot fewer cars.

Resources
World Carfree Network: http://www.worldcarfree.net/wcfd/
Calculate money saved, calories burned and emissions reduced when you go carfree: http://www.carfreediet.com/go_calc.cfm