[Jims5543]

Send a notorized registered letter stating his driveway is on her property and needs to be moved.

Before he gets the letter knock on his door, or maybe when he is out washing his tools walk over to chat and tell him you sent the letter as a CYA measure and that you will not go nuts if the drivway stays but you needed to make sure he understands he is on your property and he might have to move it if you get tired of it.

My brothers driveway encroches the neighbors vacant lot, they sold the lot to a builder who saw the driveway on the survey, the builder sent a very official letter stating they were aware fo the driveway and demanded it be moved.

That was the last he heard from them 2 years ago. CYA.