Many cities in the world are battling congestion problems with charging drivers more money to enter the city at peak travel times. Since ten years, London charges $18 to enter the city on most weekdays. Studies show reduced traffic, pollution, and fewer traffic deaths. In the US—the empire of the automobile—cities have debated similar measures but none has dared so far. Atlanta is now taking the lead with an innovate reversed approach: It will not charge drivers for entering city at certain times. Instead it will pay them for using public transit. The carrot may work even better than the stick.