Broken windows, crumpled fenders, and crime

Abstract

This study uses state-level and city-level data from the U.S. to assess the relationship between the homicide rate and the motor-vehicle fatality rate. The analysis of ecological data for a multiyear period reveals that there is a mild to moderate relationship between homicide rates and traffic-fatality rates. The limitations of ecological data are discussed. The authors argue that law enforcement can play a minor but significant role in determining the level of each type of fatality and that public perception of police activity is important. Police are most visible in their patrol and traffic functions and research suggests that controlling traffic flow has an effect on crime. Alternatively, the traffic equivalent to “broken windows” might be “crumpled fenders.” Lack of enforcement may send a signal to residents that police are absent or uncaring, leading not only to a disregard of the traffic safety rules and to higher accident rates but also to higher rates of crime in the community generally, as reflected through the homicide statistics.