Keep in mind too, you need LOS to the target of the spell... (and levitate had a range of touch, if I recall right...)
So your options are limited (remember, most glass in SR is one way!). So you are trying to float a vehicle and all occupants - gonna be heavy!
As for 'under care and control', well if there is someone driving the car (heck even sitting in it!) They are in 'control' of it for the purpose of the spell -so they can resist it.
(Don't even try the argument of keys and not touching, etc - that gets you a rulebook upside the head)