Imagine a transportation system where cars can see things that you can’t. Such cars could warn of a potential crash or icy roads ahead, advise of a traffic jam ahead, or help find a parking space. Imagine if buses could tell if you will make your next connection, mapping software could indicate the greenest travel route, and cell phones could communicate with traffic signals so disabled pedestrians can safely cross an intersection. These developments are closer than you think through the U.S. Department of Transportation (USDOT) connected vehicle research. Connected vehicles combine leading-edge technologies (GPS, Wi-Fi, wireless sensors, and dedicated short-range communications) to enable high-speed, real-time communication among vehicles, roadside infrastructure, and mobile devices. The USDOT is investing in connected vehicles because of their promise to save lives, as well as improve traffic flow, reduce environmental impacts, and make our communities safer and more livable.