Standard&Poor's Ratings Services assigned its 'AA+/A-1+' to AUSTIN Trust's series BOA 183 variable certificates related to Arizona Transportation Board's series 2007 transportation excise tax revenue bonds, issued for Maricopa County Regional Area Road Fund. The rating's long-term component is based on the 'AA+' rated underlying bonds. The rating's short-term component is based on the liquidity facility provided by Bank of America N.A. until Nov. 27, 2008.