NCHRP Synthesis 299
The objective of this synthesis was to summarize the key findings of various geometric design research efforts published in the 1990s. In the decade following the publication of the 1990 edition of AASHTOs A Policy on Geometric Design of Highways and Streets (also known as the Green Book), the research community conducted a large amount of research with potentially significant implications on safety and operations. The primary goal of this synthesis was to capture and distribute that information for consideration in the development of the 2004 edition of the Green Book.