The George Washington Bridge is a double-decked suspension bridge spanning the Hudson River between the Washington Heights neighborhood of Manhattan in New York City, and the borough of Fort Lee in New Jersey. As of 2016, the George Washington Bridge carried over 103 million vehicles per year, making it the world's busiest motor vehicle bridge. It is owned by the Port Authority of New York and New Jersey, a bi-state government agency that operates infrastructure in the Port of New York area. The George Washington Bridge is also informally known as the GW Bridge, the GWB, the GW, or the George and formerly as the Fort Lee Bridge or Hudson River Bridge. A bridge across the Hudson River was first conceived in 1906. In early 1925, the state legislatures of New York and New Jersey voted to allow for the planning and construction of such a bridge. Construction on the George Washington Bridge started in October 1927, and it opened on October 24, 1931. The opening of the George Washington Bridge contributed to the development of Bergen County, New Jersey, in which Fort Lee is located. The current upper deck was widened from six to eight lanes in 1946. The six-lane lower deck was constructed beneath the existing span from 1958 to 1962 because of increasing traffic flow. The George Washington Bridge, an important travel corridor within the New York metropolitan area, has an upper level that carries four lanes in each direction and a lower level with three lanes in each direction, for a total of 14 lanes of travel. The speed limit on the bridge is 45 mph (72 km/h). The bridge's upper level also carries pedestrian and bicycle traffic. Interstate 95 (I-95) and U.S. Route 1/9 (US 1/9, composed of US 1 and US 9) cross the river via the bridge. US 46, which lies entirely within New Jersey, terminates halfway across the bridge at the state border with New York. At its eastern terminus in New York City, the bridge continues onto the Trans-Manhattan Expressway (part of I-95, connecting to the Cross Bronx Expressway).