Nationwide, you’re more than twice as likely to die while riding a bike than riding in a car, per trip, according to a 2007 study led by Centers for Disease Control and Prevention epidemiologist Laurie Beck. Bike riding is also about 500 times more fatal than riding in a bus. Though Beck didn’t run numbers on subway and commuter rail systems, they may be the safest form of transportation of all. Despite a series of well-publicized accidents and maintenance issues, Metrorail and Metrobus reported just two injuries per million riders in 2015.