A Policy on Geometric Design of Highways and Streets, 7th Edition, 2018

A Policy on Geometric Design of Highways and Streets, 7th
Edition, 2018, commonly referred to as the Green Book, contains the
current design research and practices for highway and street geometric
design. This edition presents an updated framework for geometric design
that is more flexible, multimodal, and performance-based than in the
past. The document provides guidance to engineers and designers who
strive to make unique design solutions that meet the needs of all
highway and street users on a project-by-project basis. Not only are the
traditional functional classifications for roadways (local roads and
streets, collectors, arterials, and freeways) presented, but also an
expanded set of context classifications (rural, rural town, suburban,
urban, and urban core) to guide geometric design.  The completely
rewritten Chapter 1: A New Framework for Geometric Design, introduces
the updated approach to design, with specific design guidance throughout
each chapter.