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We find that driving fatalities increased significantly following the terrorist attacks of September 11, 2001, an event which prompted many travelers to substitute less-safe surface transportation for safer air transportation. After controlling for time trends, weather, road conditions, and other factors, we attribute an increase of 242 driving fatalities per month to additional road travel undertaken in response to 9/11. In total, our results suggest that about 1,200 driving deaths aredoi:10.2139/ssrn.677549 fatcat:dr5vvxebfzdgfeka3q2yiqnkta