A cargo wall (also known as a load bar or load lock) is a rigid securing device that locks into interior rails within a trailer. CLT "Packaging and Shipment" guidelines explain that it is used to create barriers or partitions to prevent freight from shifting during transit. This system is ideal for mixed or partial loads and requires trailers equipped with E-track or A-track rail systems. Ropes, straps, and airbags are flexible restraints that can be used in any trailer, but they do not create fixed structural separation. Cargo walls provide mechanical stability, ensuring weight distribution compliance and protecting goods and drivers from shifting loads. CLT standards stress proper placement, inspection, and use of load securement devices to maintain DOT and OSHA transport safety compliance.