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Hindsight 2020: Over the past several years, dozens of U.S. cities have committed to a new principle in road safety policy, Vision Zero, which sets the goal of completely eliminating deaths and serious injuries. The basic logic of the policy, which takes inspiration from a road safety platform in Sweden: All traffic collisions that result in death or injury—whether for pedestrians, cyclists, motorists, or any other road user—are preventable through smarter engineering, education, and enforcement.