Laws would have to change with a person in the cab you are talking about Grand Theft, Kidnapping, and Robbery. With an AI it's just Grand Theft meaning you'd spend much less time in prison.
Why would laws have to change, after all there is no kidnapping and robbery occuring. Stealing the contents of an ai-truck is less terrible than robbing a truck driver at gunpoint. There is a reason one is punished more than the other.
Exactly, the law hasn't caught up yet. Likely they'll take a cue from laws covering rail shipping, but I'm not a lawyer.