I believe the VP only becomes "acting President" and doesn't assume the actual office until sworn in by a proper authority (usually the Chief Justice of SCOTUS but I believe contingency plans exist). So it would be interesting to figure out when the immunity attaches.
I realized self-driving on roads is impossible for so-called when someone pointed out what human drivers do when there's like a flock of geese camped out in the middle of the road.
We know that we should slowly move forward until they get out of the way, including bonking then with the car (gently). Do we want cars deciding that some obstruction in the road is "ok" to hit? I don't. So what's the solution? Something other than pure autonomous self driving.
We can probably have some very high level driver assist. Maybe.