Section, added
Pub. L. 93–643, § 122(a), Jan. 4, 1975,
88 Stat. 2289; amended
Pub. L. 94–280, title I, § 135(a), May 5, 1976,
90 Stat. 441;
Pub. L. 95–599, title I, § 168(d), Nov. 6, 1978,
92 Stat. 2723;
Pub. L. 96–106, § 10(a), Nov. 9, 1979,
93 Stat. 798, related to projects for safer off-system roads.