Safety effects of cross-section design for two-lane roads. Volume 1

1987Final reportTrue, JustinPDFTech ReportFHWA-RD-87-008DTFH61-83-C-00117Two lane highwaysTraffic lanesRoad shouldersPavement wideningImprovementsTraffic accidentsUnited States. Federal Highway AdministrationZeeger, Charles V.Hummer, J.Reinfurt, D.Herf, L.Hunter, W.Goodell-Grivas, Inc.United States. Federal Highway Administration. Office of Safety DesignNational Research Council (U.S.). Transportation Research BoardNTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATIONNTL-HIGHWAY/ROAD TRANSPORTATION-DesignNTL-SAFETY AND SECURITY-Highway SafetyFederal Highway AdministrationThis study was intended to quantify the benefits and costs resulting from lane widening, shoulder widening, shoulder surfacing, sideslope flattening, and roadside improvements. Detailed traffic, accident, and roadway data were collected on 4,951 miles of two-lane roads in seven states. An accident predictive model and statistical tests were used t