New AASHTO Design

Publications

2005

New AASHTO Design Publications

A Policy on Geometric Design of Highways and

Streets (2004 Green Book)

A Policy on Design Standards – Interstate System

Guide for High-Occupancy Vehicle Facilities

Guide for Park-and-Ride Facilities

Guide for the Planning, Design, and Operation of

Pedestrian Facilities

2004 Green Book

Changes include:

Superelevation

M – Middle ordinate of

horizontal curve

Technical Corrections

Green Book + Interstate

Standards constitute basic

design standards for NHS

adopted by FHWA

Superelevation revisions include:

Reworded and rearranged topics

Friction factors revised from three separate curves to

one curve, minor changes to values for low speed

Reformatted superelevation tables, minor changes to

values for low speed design

Length of superelevation runoff moved to separate

table

New table for low speed urban streets

(superelevation optional)

Friction factors for superelevation

15 0.175 0.32

20 0.170 0.27

25 0.165 0.23

30 0.160 0.20

35 0.155 0.18

40 0.150 0.16

45 0.145 0.15

> 50 Same

Design 2001 2004

Speed Green Book Green Book

2001 Green Book

2004 Green Book

Superelevation table from 2001 Green Book

Exhibit 3-23. Values for Design Elements Related to

Design Speed and Horizontal Curvature (emax = 8%)

Superelevation table from 2004 Green Book

Exhibit 3-27. Minimum Radii for Design Superelevation Rates,

Design Speeds, and emax = 8%

Exhibit 3-58. Diagram Illustrating Components for

Determining Horizontal Sight Distance.

Middle Ordinate of Horizontal Curve -- 2001

Exhibit 3-54. Diagram Illustrating Components for

Determining Horizontal Sight Distance.

Middle Ordinate of Horizontal Curve -- 2004

HSO = Horizontal

Sightline Offset

Technical Corrections

Page 145, Replaced 8 values in Exhibit 3-14 (Minimum

radii for horizontal curves)

Page 589, Replaced 6 values in Exhibit 9-19 (Design

for turns at intersections)

Page 838, Replaced Exhibit 10-60 (Typical gore details

for exit terminals)

Page 843, Replaced column heading in Exhibit 10-67

(Design widths for turning roadways)

Corrected typos

Corrected incorrect exhibit references

Errata listings for previous editions:

http://downloads.transportation.org/Errata-GDHS-4.pdf

States are therefore allowed to use either the 2001 or 2004

Green Book as the design standard for projects on the NHS.

Replaces 1991 Policy

FHWA will formally adopt through

Federal Register process

Added metric values

Design speed for rolling terrain

eliminated, now same as level

terrain

Revised shoulder width discussion

for mountainous terrain

Sloping curbs, when allowed

outside shoulder, limited to 4-inch

height

A Policy on Design

Standards –

Interstate System

HOV Guide

Replaces 1992 Guide

Rewritten and expanded

guidance for HOV

Includes planning, design,

operation and enforcement

Separate chapters for

freeways and arterial

streets

Can also be used for HOT

lanes or managed lanes

Park-and-Ride Guide

Replaces 1992 Guide

Rewritten and expanded

to cover all elements of

the development process

Defining the type and

purpose of the facility

Includes planning,

operations, and design

Architecture, landscape,

and art

Pedestrian Guide

New publication

Purpose is to provide

guidance for

accommodating

pedestrian facilities

Scope includes

planning, design, and

operations

Includes information

about accessibility laws

and regulations