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and safety elements. These ratings, indicating relative need, were used as a tool in determining relative adequacy.
Detailed needs were determined by use of “tolerable standards” which were developed to set up minimum conditions under which transportation service can be maintained. Each route was studied in detail, to measure its adequacy, to find economically justified improvements which normally would be made, and finally to indicate a minimum program necessary to sustain transportation during the emergency period, assumed by the engineers to be 1(V years. ,
67.6%