How many lanes of traffic does the Brooklyn Bridge have?

Answer 1

14 lanes (8 upper, 6 lower)

The six-lane George Washington Bridge was completed on October 25, 1931, eight months ahead of schedule, at a cost of $59 million and 12 lives. First named the "Hudson River Bridge," other names for the bridge had been considered, including the "Palisades Bridge," "Fort Lee Bridge," "Columbus Bridge" and "Verrazano Bridge," before the Port Authority decided upon the "George Washington Memorial Bridge" in 1930. Later, the name was shortened to "George Washington Bridge." When constructing the George Washington Bridge, Ammann had foresight to allow for additional future growth. The median was reserved for either two additional lanes for vehicular traffic, or two light rail tracks. The Port Authority chose the former option, and in 1946, it increased the capacity of the bridge to eight lanes, and installed a movable median barrier to maximize peak-period flow during rush hours. (By 1970, as cross-Hudson traffic increased in both directions, the Port Authority replaced the moveable barrier with a permanent median barrier on the upper deck.) In 1955, after nearly a decade of explosive traffic growth, Robert Moses chaired the Joint Study of Arterial Facilities between the Port Authority and the Triborough Bridge and Tunnel Authority. The Joint Study was developed to spearhead construction of new bridges and expressways, including an unbuilt Hudson River Bridge between 125th Street in Manhattan and Edgewater, New Jersey. One of the proposals called for the addition of a six-lane lower level to the George Washington Bridge.

Construction of the $20 million lower deck began in 1959. The construction of the lower deck followed Ammann's original design. Without interruption to the eight traffic lanes above, 76 structural steel sections were hoisted onto the bridge from below. The lower deck was designed with a minimum clearance of 15 feet between the upper and lower deck roadways. Even with the addition of the lower deck, the bridge had a clearance of 213 feet over the Hudson River. Stiffening trusses were incorporated into the design of the lower deck to provide additional stability against torsion. The additional weight required a slight adjustment on the rollers atop the towers.

The Port Authority and other agencies allocated an additional $60 million for the construction of new approach roads, including the Trans-Manhattan Expressway and Alexander Hamilton Bridge (both part of I-95) on the New York side, and the Bergen-Passaic Expressway (which includes parts of I-95 and I-80) on the New Jersey side. The lower deck and new approach roads were completed on August 29, 1962.

Answer 2

Six lanes on the first level for cars and another level for trains also with six lanes. The daily traffic is 140,000 cars each day.