NEW YORK (S&P Global Ratings) Jan. 18, 2018--S&P Global Ratings has assigned its 'AA-' long-term rating to the Triborough Bridge and Tunnel Authority (TBTA), N.Y.'s pro forma $351.93 million series 2018A general revenue bonds. The outlook is stable. At the same time, S&P Global Ratings assigned its 'AA+/A-1' ratings and 'AA-' underlying rating (SPUR) to the TBTA's $122.64 million subseries 2003B-1 general revenue variable rate bonds; and its 'AA+/A-1' ratings and 'AA-' SPUR to the authority's $190.3 million subseries 2005B-2 general revenue variable rate bonds. "The ratings reflect our view of the TBTA's consistently strong historical financial performance and service essentiality, and our expectation the authority will maintain combined debt service coverage at levels adequate for the rating," said S&P