Project. An undertaking by a State highway department for highway construction, including preliminary engineering, acquisition of rights-of-way and actual construction, or for highway planning and research, or for any other work or activity to carry out the provisions of the Federal laws for the administration of Federal aid for highways.
23 CFR § 1.2
Terms defined in 23 U.S.C. 101(a), shall have the same meaning where used in the regulations in this part, except as modified herein.