Section 1391, Pub. L. 89–563, title I, § 102, Sept. 9, 1966, 80 Stat. 718; Pub. L. 91–265, § 2, May 22, 1970, 84 Stat. 262; Pub. L. 93–492, title I, § 110(a), title II, § 201, Oct. 27, 1974, 88 Stat. 1484, provided definitions for purposes of this subchapter. See sections 30102, 30111, and 30125 of Title 49, Transportation.

Section 1392, Pub. L. 89–563, title I, § 103, Sept. 9, 1966, 80 Stat. 719; Pub. L. 89–670, Oct. 15, 1966, 80 Stat. 931; Pub. L. 93–492, title II, § 202, Oct. 27, 1974, 88 Stat. 1484; Pub. L. 94–346, §§ 2, 3, July 8, 1976, 90 Stat. 815; Pub. L. 97–331, § 3, Oct. 15, 1982, 96 Stat. 1619; Pub. L. 102–240, title II, § 2505, Dec. 18, 1991, 105 Stat. 2084, related to motor vehicle safety standards. See sections 30103, 30111, and 30125 of Title 49.