Enacts new GS Chapter 136A for purposes indicated in title. Permits eligible local governments to constitute a joint agency for the financing, construction, and operation of regional transportation projects pursuant to a Regional Transportation Funding Agreement (RTFA) and defines permissible projects. Permits counties that are parties to an RTFA to levy a ½ percent sales and use tax and a tax of 5 cents per gallon on the retail sale of gasoline and diesel fuel. Requires that any such tax be levied by all counties who are members of the RTFA. Enacts new Article 47 of Chapter 105, Regional Transportation Funding Agreement Sales Tax, governing levy, collection, and distribution of the ½ percent sales and use tax. Recodifies in GS Chapter 136A various provisions of Articles 25, 26, and 27 of Chapter 160A.