I can't imagine it being rude if the person is coming to your house.

Wow. Most of the people I've known with driveways, though, have no street parking.
I've got a driveway vent, though. We have a parking area beside our house and the neighbor's house that will fit 4 cars. New neighbors just moved in last week and they've been pulling in so only 3 will fit, which leaves DH to have to park in front of our house. That's not really a parking spot, though, because we live in an alley. People have to slow down to a crawl to get past his car.
I hate starting off on the wrong foot with these people, but I guess we're going to have to say something.