23 U.S.C. § 102

Program efficiencies

(a) Access of Motorcycles.—

No State or political subdivision of a State may enact or enforce a law that applies only to motorcycles and the principal purpose of which is to restrict the access of motorcycles to any highway or portion of a highway for which Federal-aid highway funds have been utilized for planning, design, construction, or maintenance.

(b) Savings Provision.—

Nothing in this section shall affect the authority of a State or political subdivision of a State to regulate motorcycles for safety.

( Pub. L. 85–767 , Aug. 27, 1958 , 72 Stat. 887 ; Pub. L. 102–240, title I, § 1016(a) , Dec. 18, 1991 , 105 Stat. 1945 ; Pub. L. 105–178, title I , §§ 1206, 1209, 1212(a)(2)(A)(i), 1304, June 9, 1998 , 112 Stat. 185 , 186, 193, 227; Pub. L. 109–59, title I, § 1121(b)(1) , Aug. 10, 2005 , 119 Stat. 1195 ; Pub. L. 112–141, div. A, title I, § 1502 , July 6, 2012 , 126 Stat. 561 ; Pub. L. 117–58, div. A, title I, § 11310(a) , Nov. 15, 2021 , 135 Stat. 536 .)