where is the triboro bridge
From Wikipedia, the free encyclopedia. MTA Bridges and Tunnels, legally known as the Triborough Bridge and Tunnel Authority, is an affiliate agency of the Metropolitan Transportation Authority, that operates seven intrastate toll bridges and two tunnels in New York City.ith the last merger in 1946, the authority was renamed the Triborough Bridge and Tunnel Authority. Generating millions of dollars in toll revenue annually, the TBTA easily became a powerful city agency as it was capable of funding large capital projects.