especially in spring time when the frost cameout of the ground and the subgrade was unusually wetand soft. As a result they were rapidly ruined. Mean-while large appro-priations for roadbuilding were beingmade by manystates, and it wasrealized that ifthese appropria-tions were to bespent to the… … Figs. 1 and 2—Two ings, the bearing values of different subgrade mate-rials, effectiveness of various drainage methods, etc.This research work was undertaken by the U. S.Bureau of Public Roads. Most of the experimen-tal work is being carried out at Arlington, Va., ashort distance from Washington,…
Automobiles · Aeronautics
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