New York City's harbor and multiple waterways are what once made it the center of trade, but in modern times where water transport is less common they make it a city of bridges and tunnels. Over 2,000 of them provide uninterrupted vehicular movement throughout the region. Several agencies claim jurisdiction over this network of crossings including the New York City Department of Transportation, Port Authority of New York and New Jersey, the Metropolitan Transportation Authority (MTA), New York State Department of Transportation, New York City Department of Environmental Protection (DEP), Amtrak and the New York City Department of Parks and Recreation.
Nearly all of the city's major bridges and several of its tunnels, have broken or set records. The Holland Tunnel was the world's first vehicular tunnel when it opened in 1927. The Brooklyn Bridge, Williamsburg Bridge, George Washington Bridge, and Verrazano-Narrows Bridge were the world's longest suspension bridges when opened in 1883, 1903, 1931, and 1964 respectively.
A bridge is a structure built to span physical obstacles such as a body of water, valley, or road, for the purpose of providing passage over the obstacle. There are many different designs that all serve unique purposes and apply to different situations. Designs of bridges vary depending on the function of the bridge, the nature of the terrain where the bridge is constructed, the material used to make it and the funds available to build it.