NTSB -- NTSB Safety Recommendations H-11-31 through 33

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NTSB SAFETY RECOMMENDATION

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National Transportation Safety Board

Washington, DC 20594

October 12, 2011

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NTSB Safety Recommendations H-11-31 through -33

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The National Transportation Safety Board makes the following safety recommendations to the

American Association of State Highway and Transportation Officials:

Work with the Federal Highway Administration to establish warrants and implementation criteria for

the selection and installation of Test Level Four and Test Level Five median barriers on the National

Highway System, and publish those warrants and criteria in the Roadside Design Guide. (H-11-31) [This

recommendation supersedes Safety Recommendation H-98-24.]

Work with the Federal Highway Administration to identify cross-median crash rates that call for special

consideration when selecting median barriers, and publish the rates in the Roadside Design Guide. (H-

11-32)

Work with the Federal Highway Administration to define the criteria for median barrier selection,

including heavy vehicle traffic volume, and publish the criteria in the Roadside Design Guide. (H-11-33)

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The complete recommendation letter is available on the Web

at the URL indicated above.

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An archive of recommendation letters is available at

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Electronic versions of letters may or may not include

enclosures; however, related publications, accident

briefs, and aviation accident synopses may be found

on the NTSB website.

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