NEW YORK (Standard&Poor's) April 30, 2015--Standard&Poor's Ratings Services has assigned its 'AA-' rating to the Triborough Bridge and Tunnel Authority (TBTA), N.Y.'s series 2015A general revenue bonds. At the same time Standard&Poor's affirmed its ratings on the TBTA's obligations outstanding. The outlook is stable. "The ratings on the bonds reflect our view of the authority's consistently strong historical financial performance and service essentiality, and our expectation that debt service coverage levels will continue at levels we consider strong," said Standard&Poor's credit analyst Joseph Pezzimenti. Proceeds from the 2015A bonds will finance bridge and tunnel projects and retire the TBTA's series 2014A general revenue bond anticipation notes. The authority's bridges and tunnels are