Sandro Engel and Holger Michel are interaction design students at HAWK University, a college in Hildesheim, Germany. They wanted to discourage people from running across busy streets. So they found a way to make waiting at a traffic light fun, rather than annoying. Their solution was to build a simple video game into a traffic light.
Engel and Michel call the game STREETPONG. It only works when the crosswalk is closed. Players on opposite sides of the street use a touch screen to maneuver boards back and forth, bouncing the ball toward each other.