On Minimizing the Land Used by Automobiles and Buses in the Urban Central Core

Underground Highways and Parking Facilities

by George A. Hoffman

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An examination of the possibilities for reducing the amount of land used for urban transportation in the central city by providing automotive access with deep underground tunnels and parking areas. The cost of conventional urban highways built through densely populated areas is compared with the costs of constructing and ventilating vehicular tunnels. Design features of underground construction and travel are considered. Recommendations are given for study of the underground highway concept and development of prototype machines capable of rapid excavation of vehicular tunnels in most rock conditions.

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