Aligning Geometric Design with Roadway Context
Since 1984, AASHTO’s “Green Book”
and other roadway design criteria have been primarily based on a functional classification
system of a hierarchical network composed of arterials, collector, and local roads. However, this hierarchical functional classification system is in lack of flexibility in design, especially for a modern multimodal roadway system.
The TRB National Cooperative Highway Research Program's
NCHRP Web-Only Document 320: Aligning Geometric Design with Roadway Context
drafts the Facility Design in Context portion of a proposed
Green Book 8, using a consistent structure for the context chapters and drawing content from the Green
Book and research-based sources to support a flexible, multimodal, performance-based, and context-sensitive design process.
This Summary Last Modified On: 3/22/2022