The transformative virtues of protected bike lanes have been the focus of much research lately. A 2014 study from Portland State University determined that segregated bike paths are not only demonstrably safer for riders, they have the power to lure lapsed riders back aboard their bikes. And in a new paper in theAmerican Journal of Public Health, “Safer Cycling Through Improved Infrastructure,” the authors John Pucher and Ralph Buehler demonstrate that those cities that have invested heavily in fully protected bike paths over the last decade or so have reaped the biggest safety improvements and ridership boosts.