Colombia's Nairo Quintana, wearing the best young rider's white jersey,crosses the finish line of the 19th stage of the 2015 Tour de France on Friday. Peter Dejong/AP hide caption

itoggle caption Peter Dejong/AP

Bartender Matt Carucci told NPR in 2012 that he rarely feels safe biking in the city but often rides without a helmet anyway. "There are a lot of other ways to hurt yourself," he said. John Rose/NPR hide caption

itoggle caption John Rose/NPR