Recent Roadway Geometric Design Research for Improved Safety and Operations

This synthesis report is an update of NCHRP Synthesis of Highway Practice 299 on the same topic published in 2001. It reviews and summarizes selected roadway geometric design literature completed and published from 2001 through early 2011, particularly research that identified impacts on safety and operations. The report is structured to correspond to chapters in AASHTOs "A Policy on Geometric Design of Highways and Streets," more commonly referred to as the Green Book. Information for the synthesis study was collected using an extensive literature review and analysis.