Define your vision of 'autonomy'.

When I was a little girl, a favourite uncle of mine gave me a toy electric car for Christmas. It had one switch ON/OFF. Switch it on and the wheels drove forwards in a straight line until it hit an object. On impact, the polarity to the motor was then reversed for a couple of seconds, but because of the central front wheel (it looked like it drove on four, but the two visible front wheels were actually dummy) was housed in a curved slot, when driven backwards the car would swing to the left. The polarity would then switch back and it shot off forwards in a new direction. In this fashion it could travel all round the room - completely autonomous - until the Batteries went flat or you switched it off.