Matthew W. Witczak

This report identifies the severity and/or frequency of occurrence of aggregate availability, subgrade support, high volume change soils, and frost-susceptible soils within 97 physiographic sections of the contiguous 48 states; and qualitatively assess the potential for the influence of these factors on highway design and construction. The findings are founded on the premise that physiographic units can form an orderly filing system for accumulated engineering experience which, in the highway design field, constitutes engineering judgment. A large amount of information on the distribution of aggregates and soils in the contiguous U.S. has been compiled and presented on a series of maps.

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