I had a problem just once whilst collecting someone from the airport.
A Daughter of some old friends in England, accompanied by her female workmate, came to stay with us following a brief visit by her parents.
I had not seen the Daughter for some 10 years, when she was ten years old.
Just to be safe, my wife and I stood at the top of the exit ramp carrying a sign with young ladies name on it.
Some uniformed official approached me and asked who I was meeting. I explained it was a house guest, the daughter of some English friends.
The official said I need a permit or some such thing: he insisted he had to fill sign a form which he was carrying and demanded my ID ( passport ) and evidence of residency. He then said I would have to pay ( amount unspecified ) before I could collect my passengers.
After he had completed his form, some 10 minutes later, he told me to sign it at the bottom.
Just as I took his pen, a group of arrivals rushed ot of the door, and two abolutely gorgeous twenty year old girls rushed across to me, one giving me a great hug, calling my name and saying " It's great to see you again"
The Official tore the form off his clipboard, scrunched it up, threw it down and stamped on it, spat at it and went off in a huff.
Moral - maybe - do not take a name sign as it may look as if you do not know who you are meeting and so could be thought to be providing an unlicensed and unregistered pick-up service.
farmer