A Policy on Design Standards: 1. Interstate System. 2. Primary System. 3. Secondary and Feeder Roads, Volume 1 |
Common terms and phrases
100 vehicles 12 feet abutments alinement annual average daily areas right-of-way width assumed design speed average daily traffic character of traffic Clear width feet construction Control of Access curvature is based Defense Highways deflection angle Design speed miles divided highway edge of through-traffic end supporting piers eyes are assumed factor of safety FEEDER ROADS feet in width feet wide Flat topography Frontage Roads geometric features grade separation Gradients highway design hour Over 100 hour PMT intersection at grade Interstate and Defense Interstate highway less maximum curvature maximum grade maximum superelevation miles per hour MINIMUM DESIGN minimum widths National System one-half feet overpasses parking lane passenger vehicles pavement with respect roadway width rural highways SECONDARY AND FEEDER sidewalks sustained grade System of Interstate through-traffic lane topography Mountainous topography Traffic density classification traffic lanes two-lane highways underpasses urban areas usable width vehicles per hour vertical width of shoulder Width of surfacing