Abstract: A pallet arrestor and method for preventing the movement of a pallet, having one or more pallet tunnels for receiving the tines of a forklift is disclosed. The pallet arrestor includes a molded plastic plug which has a first portion which is configured to slot into a pallet tunnel and a front portion whose height prevents its entry into the tunnel. The pallet arrestor prevents ingress of a forklift tine into that pallet tunnel, and hence inhibits movement of the pallet, without having to move the pallet to a caged area, or the like. The plug may include a rotatable latch which in one (retracted) position allows the pallet arrestor to be inserted and removed from the pallet tunnel and which in a second (locked) position prevents or inhibits the removal of the pallet arrestor from the pallet tunnel.