CFR › Title 49 › Part 399Part 399 — Employee Safety and Health StandardsSubpart L — Step, Handhold, and Deck Requirements for Commercial Motor Vehicles§ 399.201— Purpose and scope.§ 399.203— Applicability.§ 399.205— Definitions.§ 399.207— Truck and truck-tractor access requirements.§ 399.209— Test procedures.§ 399.211— Maintenance.