Via Freakonomics – Do Bike-Helmet Laws Discourage Bicycling? – this report, Intended and Unintended Effects of Youth Bicycle Helmet Laws, Christopher S. Carpenter, Mark F. Stehr, NBER Working Paper No. 15658, Issued in January 2010
“Over 20 states have adopted laws requiring youths to wear a helmet when riding a bicycle. We confirm previous research indicating that these laws reduced fatalities and increased helmet use, but we also show that the laws significantly reduced youth bicycling. We find this result in standard two-way fixed effects models of parental reports of youth bicycling, as well as in triple difference models of self-reported bicycling among high school youths that explicitly account for bicycling by youths just above the helmet law age threshold. Our results highlight important intended and unintended consequences of a well-intentioned public policy.”
