AASHTO GREEN BOOK (GDHS-7) AASHTO Green Book - A Policy on Geometric Design of Highways and Streets, 7th Edition


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ISBN(s):
9781560516767
Published:
2018
Edition:
7th
Pages:
1047
Format:
PDF Digital Edition


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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.

 

 

Editorial Reviews

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.

 

The American Association of State Highway and Transportation Officials recently released the 7th edition of its “Policy on Geometric Design of Highways and Streets” manual – commonly referred to as the “Green Book” – which is considered by many to be the pre-eminent industry guide to current highway and street design research and practices.

 

AASHTO said the latest edition of the “Green Book” presents an updated framework for geometric design that is more flexible, multimodal, and performance-based than in the past – providing 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.

The group noted that not only are “traditional” functional classifications for roadways – such as local roads and streets, collectors, arterials, and freeways – contained within the Green Book, but so is an expanded set of new “contextual” classifications – such as rural, rural town, suburban, urban, and urban core – that will help better guide geometric design efforts.

On top of that, AASHTO said the first chapter of the new manual – entitled “New Framework for Geometric Design” – also introduces a “new approach” in terms of how functional and context classifications can be used together to create more “flexible and performance-based” designs for new projects as well as for existing roads.

 

Product Details

Edition:
7th
Published:
2018
ISBN(s):
9781560516767
Number of Pages:
1047

 

SUMMARY OF KEY REVISIONS AND UPDATES

The 2018 seventh edition of A Policy on Geometric Design of Highways and Streets (The AASHTO "Green Book") includes a number of key revisions and updates from the sixth edition, published in 2011.
The Green Book provides guidance to highway engineers and designers who strive to make unique design solutions that meet the needs of highway and street users, while maintaining the integrity of the environment. The seventh edition, specifically, describes how geometric design elements affect multiple transportation modes and recognizes the relationship between geometric design features and traffic operations.

 

CHAPTER 1:
NEW FRAMEWORK FOR GEOMETRIC DESIGN

Chapter 1 is a new chapter that explains application of the Green Book to accomplish flexible, performance-based design. The chapter presents the traditional functional classifications for roadways (local roads and streets, collectors, arterials, and freeways), as well as a new set of context classifications (rural, rural town, suburban, urban, and urban core) to guide geometric design. The chapter also explains how the functional and context classifications can be used together in a flexible and performance-based manner in the design of new construction projects, reconstruction projects, and projects on existing roads.

 

CHAPTER 2:
DESIGN CONTROLS AND CRITERIA

Chapter 2 has been reorganized to emphasize transportation of people, rather than focusing primarily on moving vehicles. The chapter discusses multimodal level of service and puts greater emphasis on lower-speed, walkable, urban zones. The pedestrian walking speeds have been updated based on recent research.

 

CHAPTER 3:
ELEMENTS OF DESIGN

The key changes to Chapter 3 include the following:
• Added an 85 mph [140 km/h] design speed to the tables for stopping sight distance
• Explained how to compute superelevation and minimum radius for design speeds greater than 80 mph [130 km/h]
• Provided more flexibility in the distribution and rate of rotation of superelevation in superelevation transitions
• Added an equation to check for potential oversupply of superelevation through superelevation transitions

 

CHAPTER 4:
CROSS SECTION ELEMENTS

The key changes to Chapter 4 include the following:
• Expanded discussion of driveway width guidelines
• Expanded discussion of median geometry to reduce cross-median crashes
• Updated noise abatement discussion based on latest FHWA guidance

 

CHAPTER 5:
LOCAL ROADS AND STREETS

Chapter 5 now includes the following:
• Revised rural traveled way and shoulder widths to more right-sized values
• Added material presenting design speed ranges for specific contexts
• Added a new section on driveways in rural areas
• Revised discussions of lane widths for urban streets to better align with the guidance for urban arterials
• Reorganized discussion of recreational roads and special purpose roads into separate sections
• Updated minimum curve radii for unpaved roads based on U.S. Forest Service guidance

 

CHAPTER 6:
COLLECTOR ROADS AND STREETS

Chapter 6 now includes the following:
• Revised rural traveled way and shoulder widths to more right-sized values
• Added material presenting design speed ranges for specific contexts
• Added discussion of high-speed to low-speed transition zones
• Revised discussions of lane widths for urban streets to better align with the guidance for urban arterials

 

CHAPTER 7:
ARTERIAL ROADS AND STREETS

The title of Chapter 7 has been changed to Arterial Roads and Streets for consistency with Chapters 5 and 6. Key changes to Chapter 7 include the following:
• Added section on design for the rural town context
• Added section on speed management in design for urban areas
• Added discussion of high-speed to low-speed transition zones

 

CHAPTER 8:
FREEWAYS

Key changes to Chapter 8 include the following:
• Revised design speed guidance to encourage right-sized and context sensitive designs in urban and suburban settings
• Removed material targeting specific levels of service

 

CHAPTER 9:
INTERSECTIONS

Chapter 9 has been updated as follows:
• Added or revised drawings and text on channelized right-turn lanes, offset left-turn lanes, bypass lanes, and reduced-conflict intersections
• Removed seldom-used figures and tables on edge-of-traveled-way designs, median design layouts, and intersection sight distance
• Added table on characteristics of non-motorized users
• Added intersection sight distance discussion for roundabouts
• Revised criteria for turn-lane length

 

CHAPTER 10:
GRADE SEPARATIONS AND INTERCHANGES

Chapter 10 now includes the following:
• Added section on diverging diamond interchanges
• Added table on maximum ramp grade
• Expanded tables of acceleration and deceleration lane lengths to include 80 mph [130 km/h] design speeds

 

 

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  • 5
    Five Stars

    Vitaliy | Oct 26th 2019

    Used for PE exam. worth every penny!!

  • 5
    five stars

    Errold2345 | Oct 26th 2019

    Download as advertised. Thank You