In 2019, more and more cities across America are encouraging their residents to commute by bicycle. Cycling, of course, is good for the environment in terms of reducing pollution from car-dominant streets, and it’s a healthier way to travel. But cities gaining new cyclists are quickly, tragically finding that they do not have the proper infrastructure to keep them safe. Cyclist fatalities have gone up 25 percent across the U.S. since 2010, and up 10 percent in 2018 itself, while all other traffic fatalities have decreased. And it matters where you live: 75 percent of these cyclist deaths occur in...