There's no way that thing self drove itself there. How would it have recharged multiple times?
Although I do believe that it's possible that their shitty software could get confused about where it is supposed to go and try to make a cross country trip.

I can't stop smiling at the idea of someone trying to hail a cyber cab in Paris Tx and then numerous cyber cabs go flying off docks on the eastern side of the country. Every few minutes another cab, each one going slightly faster than the last.