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Prior to the study conducted by the USCG and the NYSDOT, options to ameliorate the issue included a new rail tunnel under the Hudson River, the rehabilitation of the Poughkeepsie Bridge, the use of the North River Tunnels, a cross-harbor rail ferry, the use of low-profile piggyback equipment and the use of the Harlem, New Haven, and Hudson Divisions through the removal of clearance restrictions.
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In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.
Each tube provides a 21.5-foot-wide (6.6 m) roadway with two lanes and 13 feet (4.0 m) of vertical clearance. [2] Most vehicles carrying hazmats are not allowed in the tunnel, and trucks cannot use the center tube. There is a width limit of 8 feet 6 inches (2.59 m) for vehicles entering the tunnel. [3]
The code also defines the clearance that is shorter than the physical clearance to account for sag curves, bridge deflection and expected settlements with a recommendation of minimum clearance of 5 metres (16 ft 5 in). [2] In UK, the "standard minimum clearance" for structures over public highways is 16 feet 6 inches (5.03 m). [3]
The bridge provided 35 ft (11 m) of vertical clearance, a channel width of 131 ft (40 m), and carried two 34-foot (10 m) three-lane roadways in either direction between 6-foot (1.8 m) pedestrian sidewalks. [11] After the bridge's first full year of operation, it had recorded at least 3,100 openings (roughly 8–9 times per day).
The vertical clearance is 8 ft 11 in (2.72 m). The IRT Lexington Avenue Line of the New York City Subway , carrying the 4 , 5 , 6 , and <6> trains, runs parallel to the Park Avenue Tunnel in two tunnels below it.
On both sides of the island are shipping channels with 150 feet (46 m) of horizontal clearance. When closed, the bridge provides 25 feet (7.6 m) of vertical clearance. [ 7 ] [ 8 ] The swinging portion weighs 2,400 short tons (2,100 long tons; 2,200 t) and is turned by two concentric drums: the inner drum has a diameter of 36 feet (11 m) and the ...