Before revision: San Francisco Critical Mass in 2005 The car-free movement is a broad, informal, emergent network of individuals and organizations, including social activists, urban planners, transportation engineers, environmentalists and others, brought together by a shared belief that large and/or high-speed motorized vehicles (cars, trucks, tractor units, motorcycles, etc.
After revision: San Francisco Critical Mass in 2005 The car-free movement is a social movement centering the belief that large and/or high-speed motorized vehicles (cars, trucks, tractor units, motorcycles, etc.