Well, I'm not sure. If we put it into context of a city where the police care about traffic infractions, and you have some guy wearing a ski mask that runs up

Well, I'm not sure. If we put it into context of a city where the police care about traffic infractions, and you have some guy wearing a ski mask that runs up and throws a large opaque object onto the hood of a moving vehicle, I am confident that any cop worth his salt could think up a plausible reason to write a ticket for that ski-mask guy. I think it would be a minor infraction of some kind, of course: jaywalking, or mischief, or interfering with moving traffic. I think that if a cop was determined to ticket the guy, that it wouldn't matter whether the vehicle is driverless or not, it'd still be (in a cop's mind) a ticketable offense. But of course this is transpiring in San Francisco, where the cops don't care if you're mugged and beaten, or your drugstore is smash-and-grabbed, unless you happen to be Nancy Pelosi's husband.