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Record, Vol. 122, No. 15
.) A new type of tunnel pavement in the form of precast concrete blocks is installed in the I78th St. underground vehicle approach to the George Washington Bridge in New York. ~Ihe blocks, each tI} in. square and 4 in. thick, are lald with poured asphalt joints on a bituminous mastic cushion. The paving, being laid in the 2350 ft. cut and cover tunnel cutting across the upper end of Manhattan, is part of the Port of New York Authority's current program of extending the New York approach facilities, curtailed at the time the bridge was opened in 1931 pending increased traffic. Though the tunnel structure was built several years ago, it was never finished for use. Anticipated World's Fair traffic this year prompted the present plans for completion. Some form of removable block pavement in tunnels is considered necessary by the Port Authority because of the possibility of excess wear from close tracking of heavy traffic. Such removable blocks permit local repairs and replacements to be made quickly and easily with minimum interruption to traffic. The authority now has three different types of paving in three tunnels:granite block in the Holland; de-aired brick in the Lincoln; and the new type concrete block at George Washington Bridge. R. H. O.
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