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  • § 399.201
    Purpose and scope.
  • § 399.203
  • § 399.205
  • § 399.207
    Truck and truck-tractor access requirements.
  • § 399.209
    Test procedures.
  • § 399.211
  • Appendix B to Subchapter B of Chapter III—Special Agents
    Special Agents
  • Appendix F to Subchapter B of Chapter III—Commercial Zones
    Commercial Zones
  • Appendix G to Subchapter B of Chapter III—Minimum Periodic Inspection Standards
    Minimum Periodic Inspection Standards

Part 399

§ 399.205: Definitions.

Cab-over-engine (COE) A truck or truck-tractor having all, or the front portion, of the engine under the cab.

COE—High profile A COE having the door sill step above the height of the front tires.

Deck plate A horizontal surface designed to provide a person with stable footing for the performance of work such as the connection and disconnection of air and electrical lines, gaining access to permanently-mounted equipment or machinery or for similar needs.

Door sill step Any step normally protected from the elements by the cab door when closed.

Effective peripheral grip Any shaped surface, free of sharp edges, in which a full grasp can be made to secure a handhold by a person.

Fingertip grasp A handhold surface which provides a person contact restricted to finger segments 1 and/or 2 only; or which limits wrap-around closure of finger segment 1 with the palm of the hand to 90 degrees as shown in Illustration I.

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Full grasp A handhold surface which provides a person contact with finger segments 2 and 3 and which provides space for finger segment 1 to wrap around toward the palm of the hand beyond the 90-degree surface restriction shown in Illustration I. The handhold need not require contact between fingers and thumb. For example, the hand position shown in Illustration II qualifies as full grasp.

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Ground The flat horizontal surface on which the tires of a motor vehicle rest.

Handhold That which qualifies as providing full grasp if a person is able to find a hand position on the handhold which allows more than fingertip grasp.

Handprint The surface area contacted by the hand when grasping a handhold. The size of this area is the width of the hand across the metacarpal and half the circumference of the handhold. The hand breadth of the typical person is 88.9 millimeters (3.5 inches).

Person Any individual within the 5th percentile female adult through the 95th percentile male adult of anthropometric measures as described by the 1962 Health Examination Survey, “Weight, Height and Selected Body Dimensions of Adults, United States 1960-1962” which is incorporated by reference. It is Public Health Service publication No. 1000-Series 11-No. 8 and is for sale from the U.S. Department of Commerce, National Technical Information Service, 5285 Port Royal Road, Springfield, Virginia 22161. When ordering use NTIS Accession No. PB 267174. It is also available for inspection at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: This incorporation by reference was approved by the Director of the Federal Register on July 17, 1979. These materials are incorporated as they exist on the date of the approval and a notice of any change in these materials will be published in the Federal Register.

Slip resistant material Any material designed to minimize the accumulation of grease, ice, mud or other debris and afford protection from accidental slipping.


Although we make every effort to assure that the information we provide is complete and accurate, it is not intended to take the place of published agency regulations. Regulations issued by the U.S. Department of Transportation and its Operating Administrations are published in the Federal Register and compiled in the U.S. Code of Federal Regulations (CFR). Copies of appropriate volumes of the CFR in book format may be purchased from the Superintendent of Documents, U.S. Government Printing Office, or examined at many libraries.

The CFR may also be viewed online at

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