NEW YORK (S&P Global Ratings) Oct. 31, 2017--S&P Global Ratings assigned its 'AA-' long-term rating to the Triborough Bridge and Tunnel Authority (TBTA), N.Y.'s $500 million 2017C general revenue refunding bonds. The par amount on the bonds is subject to change based on market conditions. The outlook is stable. At the same time, S&P Global Ratings affirmed its ratings on other authority debt outstanding. "The ratings reflect our view of the TBTA's consistently strong historical financial performance and service essentiality, and our expectation that the authority will maintain combined debt service coverage, before mandatory fund transfers, at levels adequate for the rating," said S&P Global Ratings credit analyst Joe Pezzimenti. Bond proceeds will refund authority bonds outstanding for debt service