As robots are getting evermore human, the first of them are taking to using vehicles as a means of transportation.
From the high-end segment of robotics we learn that humanoid life-sized robot Hubo by Professor Oh Jun-ho of the Korea Advanced Institute of Science and Technology got himself a Segway Scooter and is now learning how to step on it by himself.
While from the tinkering frontier we hear of a Robonova-1 humanoid, who got a pair of hacked mini-skates. The 32cm bot overcomes his handicap of having only 17 degrees of freedom (which means in his case not being able to rotate the hip or feet accordingly to create a selfpropelled skating), by using a set of ski-poles to initiate motion.
Even more interesting robot locomotion (without external vehicles):
Ways of Locomotion, Evolution reserved for Robots,
Ballbot I've been waiting for.