An OTREC report from Oregon State University looked at various center median and bicycle lane configurations, and how they affect traffic at road access points.
In the American Association of State Highway and Transportation Officials (AASHTO) publication A Policy on Geometric Design of Highways and Streets, commonly known as the Green Book, access points include the intersections of public roads as well as driveway locations. In the Green Book, most of the supporting research for the spacing of driveways is based on standard highway design procedures. They include simple human factors and geometric principles, and have not been thoroughly evaluated based on a variety of road cross section configurations.
Principal investigator Karen Dixon of Oregon State University sought to close this research gap by evaluating the influences of select cross-sectional-related design elements, specifically median configurations and bicycle lanes, on driveways.
Dixon's research team evaluated eight physical sites and four simulated scenarios with different driveway spacing and roadway cross section designs. The primary research goal...Read more