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There is every likelihood that highways at least in the more advanced sections of the worldwill have passed their peak in 2014; there will be increasing emphasis on transportation that makes the least possible contact with the surface. There will be aircraft, of course, but even ground travel will increasingly take to the aira foot or two off the ground. Visitors to the 1964 fair can travel there in an “aquafoil,” which lifts itself on four stilts and skims over the water with a minimum of friction. This is surely a stop-gap. By 2014 the four stilts will have been replaced by four jets of compressed air so that the vehicle will make no contact with either liquid or solid surfaces.