To further carry out the purposes set forth in section 421 of this title, the departments listed in subsection 422(a) of this title may improve lands held for those purposes with publicly owned and controlled rest and recreation areas which may include, among other things, sanitary facilities, and other facilities reasonably necessary to accommodate the traveling public. (1966, No. 67 (Sp. Sess.), § 4, eff. March 14, 1966.)