This article shall constitute full and complete authority for the district, without regard to the provisions of any other law, for doing the acts and things herein authorized. This article, being necessary for the welfare of the Commonwealth and its inhabitants, shall be liberally construed to effect the purposes hereof. Any court test concerning the validity of any bonds which may be issued for transportation improvements made pursuant to this article shall be determined pursuant to Article 6 (§ 15.2-2650 et seq.) of Chapter 26 of this title.