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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.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2022. Aligning Geometric Design with Roadway Context. Washington, DC: The National Academies Press. https://doi.org/10.17226/26535.

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Publication Info

236 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/26535
Chapters skim
Front Matter i-iv
Chapter 1: Introduction 1-6
Chapter 2: Research Tasks and Findings 7-56
Chapter 3: Future Suggested Research 57-61
Appendix A: Summary of Survey Outreach 62-108
Appendix B: Literature Review Resources 109-111
Appendix C: Annotated Outline of Part IV Chapters 112-231

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