Zones move with the freight
The essential feature of a cross-dock is that the floor is the storage. Freight is staged in marked areas by destination, worked, and loaded out, so a section that is full at eight is empty at ten and full again by noon. Nobody can predict which section will be clear at a given hour, but at any hour some of them will be. Which section that is changes hour by hour and cannot be rostered.
That makes a rolling arrangement the only workable one. The crew cleans whichever zones are clear, records them, and the cycle continues at the next attendance from where it left off. Over a month every zone is covered several times, and the record shows which zones are consistently unavailable, which is useful operational information in its own right. Sites often use that record to reconsider how a bay is allocated.
