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Before the advent of the motor vehicle, roads in most parts of the world were generally poor. The available methods of road transport were so costly and inefficient that, unless there were special considerations such as military movements, it was not worthwhile to maintain roads for other than local traffic. The general use of automobiles created a strong demand for better highways. The first response was to provide for the improvement of existing road networks. Experience subsequently demonstrated that roads for automobile traffic needed to be differentiated functionally, depending on whether they were intended for through traffic or local traffic. ...(100 of 10282 words)