These cities have the riskiest drivers in the U.S., study finds

Related video above: "Speed warning chime in every car? It's coming, and Americans are ready"(NEXSTAR) – For those who have long suspected that drivers in their city may be the worst in the U.S., this ranking is for you.As part of its "America's Best Drivers Report," Allstate ranked motorists in the 100 most populous cities based on data from Arity, which powers the company's optional safe driving program. Arity uses mobile device sensors to track on-the-road behaviors such as hard braking