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.