I haven't done any car meets but wouldn't rule it out and i base that on the following. Not saying folk should take my word for it as, as ive already said, i can't speak from experience. I just don't think the police are hugely bothered about paid sex so long as the girls haven't been trafficed, coerced, or controled against their will.
My two penneth is that the definition of soliciting is loosely based on openly selling a service. A very good definition of curb crawling has already been given, the crux of which seems (to me at least) to focus on the driver propositioning a woman or worse still, harassing her.
If you're arranging the meet by phone then picking the girl up, not a single word needs to be passed between the two parties until you've driven away. I say it would take a pretty keen eyed copper to spot what just happened unless they knew the pick up was going to happen.
I guess the scope to fuck up is if you mistake another girl for the one you're picking up but so long as you get a good description or better still, know the girl you're picking up, i would be comfortable with going ahead with it.
I believe police stings or patrols that aim to pick up curb crawlers are generally based on complaints from local residents sick of seeing working girls ply their trade or complaints from females who punters have wrongly propositioned.
Be interesting to hear from any punters on here who've actually had their collar felt for picking a lass up for a car meet? Just doesn't seem to something you read about any more.