yes only one passenger at a time - so no car woohoo. I hadn't read the blurb or I'd have known that
I tried in game. With two controllable sims, the action just drops out of the queue, but an uncontrollable sim got stuck on the drive when asked to join her boyfriend. Had to force error twice to unstick her. That's irritating - "ask to join" shouldn't come up in the first place if the action isn't possible.
The other thing that doesn't work without NL is the car turntable "show 'n ride" or whatever the name is. I got the turntables with OFB even though I didn't have NL, but I can't place the mustang on tit.
I can make a car lot anyway using wholesale mode and moveobjects to place the cars on the ground. Numenor said he'd look at it.