Publisher blurb from their website:
Urban Flow is a game about the subtle beauty of city streets filled with cars moving in perfect harmony. But such order does not happen all by itself - the city needs YOU to control the traffic lights and to make sure everything goes smoothly. That means no crashes, no jams. Everything will run perfectly - as long as you stay focused!
Switch lights, keep the city safe! Urban Flow is aimed for fans of action puzzles, good single player content, local multiplayer games and urban music!