AADT

Annual average daily traffic

ADT

Average daily traffic

Caltrans

California Department of Transportation

CMF

Crash modification factor

DOT

Department of Transportation

FHWA

Federal Highway Administration

HFST

High friction surface treatment

HSIP

Highway Safety Improvement Program

ICE

Intersection control evaluation

ITE

Institute of Transportation Engineers

LPI

Leading pedestrian interval

LRSP

Local road safety plan

LTAP

Local Technical Assistance Program

MUTCD

Manual on Uniform Traffic Control Devices

PHB

Pedestrian hybrid beacon

PROWAG

Public Right-of-Way Accessibility Guidelines

PSC

Proven safety countermeasure

RCUT

Restricted crossing U-turn

RRFB

Rectangular rapid flashing beacon

RSA

Road safety audit

Safety countermeasures

SHSP

Strategic Highway Safety Plan

SSC

Speed safety camera

STEP

Safe Transportation for Every Pedestrian

VSL

Variable speed limit

VTrans

Vermont Agency of Transportation

Implementation of Federal Highway Administration Proven Safety Countermeasures
2025

Download PDF

You must be logged in to download this publication.

Select Book Type

Paperback - $25.20
Ebook - $20.69

Buy the book

Request an exam or desk copy

For decades, public safety has been a priority for state departments of transportation (DOTs) as they strive to reduce traffic crashes. To support these efforts, the Federal Highway Administration's (FHWA) Office of Safety developed a list of proven safety countermeasures that include brief descriptions, information sheets, and additional references. These measures have been field-tested and proven to reduce crashes.

NCHRP Synthesis 639: Implementation of Federal Highway Administration Proven Safety Countermeasures, from TRB's National Cooperative Highway Research Program, documents state DOT practices regarding the implementation of FHWA proven safety countermeasures. Case examples from six state DOTs provide additional information on the practices related to the FHWA proven safety countermeasures.

Additional materials

Appendix D

Publication information

296 pages · 8.5 x 10 · paperback
ISBN Paperback: 0-309-71676-4
ISBN Ebook: 0-309-71677-2
DOI: https://doi.org/10.17226/28855

Suggested citation

National Academies of Sciences, Engineering, and Medicine. 2025. Implementation of Federal Highway Administration Proven Safety Countermeasures. Washington, DC: The National Academies Press.

Import this citation to:

Bibtext
EndNote
Reference manager

First Name
Last Name
Email (required)
I agree to receive emails from the National Academies (required)

We respect your privacy and will never share your information.

Search this publication

Front Matter i-x
Summary 1-5
1 Introduction 6-8
2 Literature Review 9-65
3 Survey Results 66-82
4 Case Examples 83-101
5 Summary of Findings 102-111
References 112-131
List of Abbreviations 132-132
Appendix A: Survey Questionnaire 133-158
Appendix B: List of Responding DOTs and Individual Survey Responses from DOTs 159-282
Appendix C: Typical Case Example Interview Questions 283-283
Appendix D: Summary of Existing Literature, Policies, and Guidance for FHWA PSCs 284-286

Log In

Former MyNAP users: You'll need to reset your password on your first login to MyAcademies. Click "Forgot password" below to receive a reset link via email. Having trouble? Visit our FAQ page to contact support.

Members of the National Academy of Sciences, National Academy of Engineering, or National Academy of Medicine should log in through their respective Academy portals.

Email (required)
Password (required)

Don't have an account?

Register

Email (required)
New password (required)
Retype password (required) Password must be at least 8 characters
I accept the terms of use
terms of use

Thank You

Thank you for creating a MyAcademies account!

Enjoy free access to thousands of National Academies' publications, a 10% discount off every purchase, and build your personal library.

Forgot Password

Enter the email address for your MyAcademies (formerly MyNAP) account to receive password reset instructions.

Email (required)

Reset Requested

We sent password reset instructions to your email . Follow the link in that email to create a new password. Didn't receive it? Check your spam folder or contact us for assistance.

Reset Password

New password (required)
Retype password (required) Password must be at least 8 characters

Reset Password

Your password has been reset.

Verify email

Verify Your Email Address

We sent a verification link to your email. Please check your inbox (and spam folder) and follow the link to verify your email address. If you did not receive the email, you can request a new verification link below

Implementation of Federal Highway Administration Proven Safety Countermeasures (2025)

Chapter: List of Abbreviations

List of Abbreviations