From the other thread:
Quote: "I mean, could you walk up to one, press enter to enter, and have your player disapear, you taking control of the vehicle, and when you exit, you respawn where the vehicle is?"
...nope.
The spawning and teleporting portions of the illusion might be passable, but taking control of the vehicle in a convincing fashion isn't possible at this time.
Vehicles have been attempted on numerous occasions (
I've even toyed with it myself), but collisions always become a roadblock.
It's even been tried to make a HUD for the vehicle. The hardcoded crouching and mouselook quickly ruin this attempt at the illusion...