Seven Experiment Designs Addressing Problems of Safety and Capacity on Two-Lane Rural Highways : Volume 2. Experimental Design to Develop and Evaluate Dynamic Aids for Narrow Bridges

1978PDFTech ReportDOT-TSC-FHWA-78-02-2;PB-284 403Highway capacityRural highwaysTwo lane highwaysDivided highwaysHighway safetyWarning signsWarning systemsIntersectionsSafety engineeringState of the art studiesTraffic control devicesTraffic signsBridgesSafety measuresTraffic safetyUnited StatesUnited States. Federal Highway AdministrationKing, G. F.Abramson, P.Cohen, J. W.Wilkinson, M. R.John A. Volpe National Transportation Systems Center, (U.S.)NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATIONNTL-OPERATIONS AND TRAFFIC CONTROLS-OPERATIONS AND TRAFFIC CONTROLSNTL-SAFETY AND SECURITY-SAFETY AND SECURITYNTL-SAFETY AND SECURITY-Highway SafetyVolpe National Transportation Systems Center, Technical Reference Center;Federal Highway AdministrationA large number of bridges on two-lane rural highways are narrow bridges. While there is no universally accepted definition of this type of bridge, it is generally considered to be one where the roadway and/or shoulders narrow significantly. It has been recognized that this situation produces accidents with either the bridge structure, oncoming vehicles or both. In this volume, an experimental design was developed to measure the relative effectiveness of various types of active and passive devices to warn motorists of the presence of a narrow bridge ahead. Suggested measures of effectiveness and the necessary statistical tests are described. In addition, a state-of-the art survey and bibliography are presented