The ACE (Autonomous City Explorer) robot was built by the researchers at the Technical University of Munich. This funky little bot asks people for directions as it travels down the street. ACE uses cameras to recognize people and stops them to asks them to point in the direction that is indicated on its screen, and is able to recognize the direction the people point. The bot uses maps out the city as it goes along the streets.
On the test run ACE was able to go a little under a mile just by asking 38 people to point the directions on the screen in about 5 hours. Better than the bum that circles the buildings downtown and asks for directions to a place just south of heaven.