SN 66 - Spring Brake System or Dock Lock in lieu of Chocking as Means to Secure Trucks or Trailers at a Loading Dock

This OSH Standards Notice provides interpretive guidance for the use of spring-loaded brakes or "dock locks" in lieu of chocking as a means to secure trucks or trailers at a loading dock (1910.178). 

Also reference CPL 02-01-030, Chocking Tractor Trailers Under the Powered Industrial Truck Standard, SN 52 - Conversion of, Modification of, and Additions to Industrial Trucks and CPL 02-01-028, Compliance Assistance for the Powered Industrial Truck Operator Training Standards . Additional information can be found on the safety and health topic page for Powered Industrial Trucks.