§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.

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.

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, as used in this part, means:

(1) Any individual within the 5th percentile female adult through the 95th percentile male adult of anthropometric measures as described by Weight, Height and Selected Body Dimensions of Adults, United States 1960–1962.

(2) Vital and Health Statistics; Series 11, No. 8 (6/65), Weight, Height and Selected Body Dimensions of Adults, United States 1960–1962, issued June 1965 (first issued in Public Health Service publication No. 1000, then reprinted DHEW publication No. (HRA) 76–1074), is incorporated by reference into this section with the approval of the Director of the Federal Register under 5 U.S.C. 552(a) and 1 CFR part 5.1. This material is available for inspection at FMCSA and at the National Archives and Records Administration (NARA). Contact FMCSA at the Department of Transportation Library, 1200 New Jersey Avenue SE, Washington, DC 20509; (202) 366–0746; website: https://transportation.libanswers.com. For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email fr.inspection@nara.gov. You may also obtain the material electronically from the U.S. Centers for Disease Control and Prevention, phone: (800) 232–4636; website: www.cdc.gov/cdc-info/forms/contact-us.html. Download the material at www.cdc.gov/nchs/data/series/sr_11/sr11_008.pdf. Change NoticePrevious Text

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

[91 FR 45662, July 21, 2026]