Abstract
Police reports of 495 accidents were studied, bicyclists compliance with traffic laws measured, participants in collisions interviewed, and 2994 bicyclist and motorists surveyed in a questionnaire study. The interviews and questionnaire survey were concerned with gauging knowledge of traffic laws and attitudes of motorists and cyclists toward each other. Bicyclist disregard of basic traffic laws is a major factor in most accidents and motorists are shown to be more willing to assume responsibility for their traffic safety.