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2101 Constitution Ave aggregate alinement American Association amount areas asphalt average base binder bituminous material bridge bypass routes capacity cement cents compaction construction cost crete culverts density developed drainage engineer equipment expenditures expressway Federal Federal-aid feet figure frontage roads funds grade granular materials group index highway departments Highway Officials Highway Research Board improvement inches intersection limit liquid limit maintenance maximum ment method mileage miles per hour million mixture moisture obtained operation passenger cars passing pavement percent plasticity index practice Public Roads Administration ramp revenues roadway Rotary Intersections routes rural highways rural roads samples sieve sight distance slope soil specifications speed standard streets structure subgrade superelevation taxes terial thickness tion toll roads traf traffic volumes trucks ture U. S. Government Printing units urban usually volume of traffic Washington 25 wearing course wheel load width