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Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [29] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.
[7] [8] The portals of each tube contain flood doors weighing 20 short tons (18 long tons; 18 t) and measuring 2 feet (0.61 m) thick, 14 feet (4.3 m) across, and 29 feet (8.8 m) tall. [ 9 ] The tunnel was originally commissioned by the New York City Tunnel Authority, whose chief engineer Ole Singstad created the tunnel's original designs.