---
kind: "section"
citation: "49 C.F.R. § 575.2"
title: "49"
number: "575.2"
heading: "Definitions."
url: "https://uscodex.org/cfr/49/575.2"
---

# §575.2. Definitions.

- (a) **Statutory definitions.**
  - (1) All terms used in this part, subject to [paragraph (a)(2)](#a-2) of this section, that are defined in [49 U.S.C. 30102](/usc/49/30102.md), are used as defined therein.
  - (2) All terms used in [Subpart D](/cfr/49/subpartD.md) of this part that are defined in [15 U.S.C. 1231](/usc/15/1231.md), are used as defined therein.
- (b) **Motor Vehicle Safety Standard definitions.** Unless otherwise indicated, all terms used in this part that are defined in the Motor Vehicle Safety Standards, [part 571](/cfr/49/part571.md) of this subchapter (hereinafter “the Standards”), are used as defined in the Standards without regard to the applicability of a standard in which a definition is contained.
- (c) **Definitions used in this part.** Owners manual means the document which contains the manufacturers comprehensive vehicle operating and maintenance instructions, and which is intended to remain with the vehicle for the life of the vehicle.

  Skid number means the frictional resistance measured in accordance with ASTM E 274 (incorporated by reference, see [§ 575.3](/cfr/49/575.3.md)) at 40 miles per hour, omitting water delivery as specified in paragraph 7.1 of ASTM E 274 (incorporated by reference, see [§ 575.3](/cfr/49/575.3.md)).


## Notes

### Amendments

[35 FR 6867, Apr. 30, 1970, as amended at 38 FR 5339, Feb. 28, 1973; 48 FR 44081, Sept. 27, 1983; 54 FR 48749, Nov. 27, 1989; 64 FR 27924, May 24, 1999; 75 FR 15944, Mar. 30, 2010]

### Source

Source: 35 FR 6867, Apr. 30, 1970, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 32302, 32304A, 30111, 30115, 30117, 30123, 30166, 30181, 30182, 30183, and 32908, Pub. L. 104-414, 114 Stat. 1800, Pub. L. 109-59, 119 Stat. 1144, Pub. L. 110-140, 121 Stat. 1492, 15 U.S.C. 1232(g); delegation of authority at 49 CFR 1.95.

### Amendments

[35 FR 6867, Apr. 30, 1970, as amended at 38 FR 5339, Feb. 28, 1973; 48 FR 44081, Sept. 27, 1983; 54 FR 48749, Nov. 27, 1989; 64 FR 27924, May 24, 1999; 75 FR 15944, Mar. 30, 2010]