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FHWA Home / Safety / Roadway Departure / Low-Cost Treatments for Horizontal Curve Safety 2016

Low-Cost Treatments for Horizontal Curve Safety 2016

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This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document.

The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers' names appear in this report only because they are considered essential to the objective of the document.


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The Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement.

Technical Documentation Page

1. Report No.


2. Government Accession No.

3. Recipient's Catalog No.

4. Title and Subtitle

Low-Cost Treatments for Horizontal Curve Safety 2016

5. Report Date

January 2016

6. Performing Organization Code

7. Authors

Richard Albin, Victoria Brinkly, Joseph Cheung, Frank Julian, Cathy Satterfield, William Stein, Eric Donnell, Hugh McGee, Ann Holzem, Matthew Albee, Jonathan Wood, Fred Hanscom

8. Performing Organization Report No.

9. Performing Organization Name and Address

Pennsylvania Transportation Institute
Pennsylvania State University
201 Transportation Research Building
University Park, PA 16802

Vanasse Hangen Brustlin, Inc (VHB)
8300 Boone Blvd., Suite 700
Vienna, VA 22182-2626

10. Work Unit No.

11. Contract or Grant No.


12. Sponsoring Agency Name and Address

Federal Highway Administration Office of Safety
1200 New Jersey Ave., SE
Washington, DC 20590

13. Type of Report and Period Covered

Final Report, April 2014 – January 2016

14. Sponsoring Agency Code


15. Supplementary Notes:

The contract manager for this report was Joseph Cheung.

16. Abstract

FHWA created the Low-Cost Treatments for Horizontal Curve Safety in 2006 (McGee and Hanscom, 2006). There have been many advances in highway safety since that initial 2006 guide. The purpose of this publication is to serve as an update to the 2006 Low-Cost Treatments for Horizontal Curve Safety. The primary audience for this publication is local transportation agencies. This publication provides information specifically relating to lower volume two-lane roads and the agencies that manage them. It will help transportation agencies and their construction crews understand the available countermeasures and how to select and apply them.

17. Key Words

horizontal curves, systemic approach, low-cost countermeasures, two-lane roads

18. Distribution Statement

No restrictions.

19. Security Classif. (of this report)


20. Security Classif. (of this page)


21. No. of Pages:


22. Price

Form DOT F 1700.7 (8-72) Reproduction of completed pages authorized

Table of Contents

List of Tables

List of Figures


AADT Average Annual Daily Traffic
ADT Average Daily Traffic
AASHTO American Association of State Highway and Transportation Officials
Caltrans California Department of Transportation
CMF Crash Modification Factor
DOT Department of Transportation
FARS Fatality Analysis Reporting System
FHWA Federal Highway Administration
FLH Federal Lands Highway
HFST High Friction Surface Treatment
HSIP Highway Safety Improvement Program
HSM Highway Safety Manual
ICWS Intersection Conflict Warning System
IDOT Illinois Department of Transportation
INDOT Indiana Department of Transportation
ITE Institute of Transportation Engineers
KYTC Kentucky Transportation Cabinet
LED Light-Emitting Diode
LON Length of Need
MnDOT Minnesota Department of Transportation
MoDOT Missouri Department of Transportation
MUTCD Manual on Uniform Traffic Control Devices
NCAT National Center for Asphalt Technology
NCHRP National Cooperative Highway Research Program
NHTSA National Highway Traffic Safety Administration
NJDOT New Jersey Department of Transportation
NYSDOT New York State Department of Transportation
PC Point of Curvature
PDO Property Damage Only
PennDOT Pennsylvania Department of Transportation
ROR Run-Off-Road
RPM Raised Pavement Marker
RSA Road Safety Audit
SEAHC Surface Enhancements at Horizontal Curves
SSP Safety Strategic Plan
SV Superelevation Variance
usRAP The United States Road Assessment Program
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Page last modified on March 24, 2020
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