Understanding active transportation for school-aged children is an important part of fighting the increasing childhood obesity rates. In addition to a supportive physical environment, this research suggests that neighborhoods must have high levels of social trust and cohesion for children to use active methods of transportation. The study focuses on children getting to and from school by walking, biking, skating, skateboarding, or scooting in the San Francisco Bay area. Interviews will be conducted with families with school-aged children to obtain information about views on the social environment and the children’s physical activity. The researchers will also collect data on the built environment and crime rates in each neighborhood. They will then test to see if the social environment acts to affect children’s activity either alone or as related to the built environment. If the social environment proves to have a strong influence on children's behavior, programs aimed at increasing non-motorized travel to school, e.g. Safe Routes to School, should incorporate community building as a funding priority.