Because there is so much speculation about the nature and functionality of the upcoming vehicles, we have already been told the following:
You might draw some conclusions from that.
During the preview bank raids it could furthermore be seen that the vehicles were equipped to the avas like tools and seemed to function like tools. I can’t quite imagine that there would’ve been a conceptual change since then.
So you might expect that vehicles can be put away in the personal inventory and the storage. That you can leave a vehicle behind by "dropping" it, which would allow any other ava to "pick up" the vehicle and become the new owner. And that you can travel with your vehicles between continents, planets and space stations by just having them in your inventory while using TPs.
"Driving" would in fact be running with a vehicle equipped (with increased speed).
The preview vehicles were fully permeable, btw, so there wouldn’t be any running-overs, and mobs and PKers can attack you in every way as usual.
What I really wonder, though, is how MA is to get the thousands of mobs off the streets. I gather, they won’t...