nited States Federal Highway Administrarion text monographic issued by Office of Puclic Roads and Rural Engineering Title from cover. Roads United States Periodicals Highway research United Sattes Periodicals TD 2.19: TD 2.19: http://purl.access.gpo.gov/GPO/LPS1663 http://purl.access.gpo.gov/GPO/LPS1663 20160527183600.0 299324