The Possession Protection Constraints Register (PPCR) is set up in PACT by the NAM and is used to describe the protection arrangements for the specific Configuration, Closedown or Midweek possession. This document describes the placement sequence, LPA stage number, type of protection required (flag, RTS, light, point clip), the area, location, track name, turnout number. The PPCR is approved prior to the prepossession meeting