Click on the first link in this post, and you won't need to ask that question again.

The PVD allows centerline tracking based on the localizer, creating a progressive apparent lateral movement in the direction needed for recapture. Like CAT III landings, one of the hardest parts of the procedure is to then vacate without running off the asphalt or hitting something (which the PVD does not provide guidance for). Vacating is not so much of an issue with take-offs