As a controller I can't really comment on Ops Manual procedures but bear in mind that here in the UK LVPs can involve far more than just using CAT III holds. Many other restrictions are introduced to limit the number of vehicle (and sometimes aircraft) in airside areas and often to physically block runway access points that will not be used. At airports that do not have surface movement radar it is common for movement on the manoeuvering area to be limited to one at a time. These procedures are intended to prevent unauthorised runway incursions but may also be taken into account by the Ops Manual.