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Research has concluded that regulatory attempts to improve fuel economy, such as the Corporate Average Fuel Economy (CAFE) Standards, lower the average weight of an automobile. Ceteris paribus, this reduction in weight is detrimental to the overall level of vehicle safety. However, this study attempts to explicitly measure possible behavioral responses on the part of drivers that could offset some of the loss in safety. The results indicate that CAFE, although increasing the vulnerability rate by approximately 20%, has reduced the accident rate by 26%. The net effect on the fatality rate is a decrease of approximately 6%.