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100 vehicles 12 feet abutments alinement annual average daily areas right-of-way width assumed design speed average daily traffic Barrier curbs character of traffic construction Control of Access curvature is based Defense Highways deflection angle Desirable Absolute divided highway driver whose eyes edge of through-traffic end supporting piers eyes are assumed factor of safety FEEDER ROADS feet in width feet wide frontage roads geometric features grade separation higher design speed highway design HIGHWAYS PRIMARY hour Over 100 including the usable intersection at grade Interstate and Defense Interstate highway less maximum curvature maximum grade maximum superelevation miles per hour minimum widths one-half feet overpasses parking lane passenger vehicles pavement with respect Pedestrian traffic densities roadway width rural highways SECONDARY AND FEEDER sidewalks sustained grade System of Interstate through-traffic lane traffic density classification traffic lanes two-lane highways underpasses urban areas usable width vehicles per hour vertical width of shoulder