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FHWA Home / Safety / Roadway Departure / Cable Barriers

Cable Barriers

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Many States are installing cable median barriers in locations where there is a high potential for crossover crashes. Studies in Washington State and North Carolina have shown substantial reduction in fatal and injury crashes compared to other types of median barriers. The FHWA recommends that States review median crossover crash histories to identify locations where median barriers may benefit safety, and consider use of cable median barriers where appropriate.

Design Standard and Placement Considerations

Suitable for use on flat or moderately sloped terrain, cable barriers deflect laterally to absorb collision forces and reduce the impact on vehicle occupants. Installation costs are relatively inexpensive compared to concrete and metal beam barriers, and repair and maintenance costs can be off set by safety benefits.

Cable barriers are ideal for retrofit application on existing median areas. Median crossover crashes tend to be severe, and median encroachments are likely to increase with higher traffic volumes. In the 2006 AASHTO Roadside Design Guide, chapter 6 update, the warrants for median barriers were revised to encourage use of barriers in medians of up to 50 feet wide. Most States that have installed cable median barriers report a decrease in cross-median crash fatalities of 90 percent or more. [M.H. Ray for Washington State DOT, 2007]

Photo of a rural two-lane highway separated by a grassy median. A cable barrier runs along the edge of the roadway separating the shoulder from the median.
Source: Brifen USA, Inc.

Appropriate barrier selection and placement are critical to crash performance. Some key design considerations for cable barriers are discussed below.

Photo of a straight roadway stretching into the distance. The road has a wide unpaved shoulder, and a cable barrier positioned in the grass about a foot back from where the shoulder and grass meet, paralleling the roadway. The grassy area stretches about 8-10 feet from the roadway before becoming overgrown trees and vegetation.
Source: FHWA

Agencies should carefully review the FHWA acceptance letters on cable barriers systems for conditions and cautions that they should consider when designing roadside features. The AASHTO Roadside Design Guide is also a source of information that designers should use to help select and design barrier installations.

For More Information

AASHTO's Technology Implementation Group Cable Median Barriers Website:
http://tig.transportation.org/?siteid=57&pageid=2197

AASHTO-AGC-ARTBA Online Barrier Hardware Guide:
http://aashtotf13.tamu.edu/

FHWA Crash Test Acceptance Letters for Longitudinal Barriers:
http://safety.fhwa.dot.gov/roadway_dept/policy_guide/road_hardware/barriers/

FHWA Corporate and Research Technology Web Site on Cable Barriers:
http://www.fhwa.dot.gov/crt/lifecycle/cable.cfm

FHWA Information Memorandum: Cable Barrier Considerations. July 20, 2007:
http://safety.fhwa.dot.gov/roadway_dept/policy_guide/road_hardware/policy_memo/memo072007/

Roadside Design Guide, AASHTO, 2006:
https://bookstore.transportation.org/Item_details.aspx?id=148


Nicholas Artimovich
FHWA Office of Safety
Roadway Departure Team
Nick.artimovich@dot.gov
202-366-1331
http://safety.fhwa.dot.gov/





1 "Performance Evaluation of Low-Tension, Three-Strand Cable Median Barriers on Sloped Terrains," prepared by NCAC under contract to the FHWA, April 2007. [ Return to note 1. ]

2 "Analyses of Placement Effects on Cable Barrier Systems for Varying Median Cross Sections," prepared by NCAC under contract to the FHWA, June 2007. [ Return to note 2. ]

Page last modified on January 30, 2014.
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