Officials struggled for years to curb high-speed crashes along a residential corridor cutting through Albuquerque, New Mexico, but simply punishing the lead-footed drivers didn’t seem to work. What ultimately did was rewarding the law-abiding ones with fewer red lights. The solution, which the city credits for a dramatic drop in crashes and injuries along one busy stretch of road, is a relatively novel version of a longstanding traffic safety concept commonly known as “rest in red," in to...