Missouri Transportation Institute - research group including 10 colleges and universities in Missouri, studying transportation issues, problems, and finances.
European Federation of Road Traffic Victims has much interesting information about European traffic laws and practices. In many European countries walking and bicycling make a much higher proportion of trips than in the U.S., and at the same time the rate of injury and death of bicyclists and pedestrians is much lower. Perhaps the U.S. should adopt some of the strategies outlined here?
Safe Routes to Schools really works--the Marin County Bicycle Coalition, which sponsored one of the first Safe Routes to School programs in the U.S., found these changes in just two years of their Safe Routes to Schools program