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Safety Eligibility Letter B-34H

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U.S. Department of Transportation
Federal Highway Administration

1200 New Jersey Ave. S.E.
Washington, D.C. 20590

April 23, 2013

In Reply Refer To:

Mr. Marc Christensen
OTW Safety
P.O. Box 1461
Salt Lake City Utah  84110

Dear Mr. Christensen:

This letter is in response to your request for the Federal Highway Administration (FHWA) to review a roadside safety system for eligibility for reimbursement under the Federal-aid highway program. 

Name of system: MB-350 Barrier
Type of system: Water Filled Barrier
Test Level: NCHRP Report 350 Test Level 3
Testing conducted by: N/A
Date of request: December 5, 2011 and February 13, 2013
Date initially acknowledged: December 6, 2011
Date of completed package: February 26, 2013

The following device is eligible, with details provided in the form (Attachment 1) and a narrative description (Attachment 2) which are included as integral parts of this letter:

Based on a review of prior crash test results and documentation on proposed modifications submitted by the manufacturer certifying the device described herein meets the crash test and evaluation criteria of the National Cooperative Highway Research Program (NCHRP) Report 350, the device is eligible for reimbursement under the Federal-aid highway program.  Eligibility for reimbursement under the Federal-aid highway program does not establish approval or endorsement by the FHWA for any particular purpose or use.

The FHWA, the Department of Transportation, and the United States Government do not endorse products or services and the issuance of a reimbursement eligibility letter is not an endorsement of any product or service.

Roadside safety devices should meet the guidelines contained in the National Cooperative Highway Research Program (NCHRP) Report 350 or the American Association of State Highway and Transportation Officials' Manual for Assessing Safety Hardware (MASH).

On February 26, 2013, you provided the attached description of the evolution of the MB350 barrier.  In addition, on September 21, 2007, you provided information indicating the strength of the hitch pin was a 100,000 psi yield strength which exceeded the 85,000 psi yield of the Grade 5 bolt that was used in the original crash testing.

Therefore, the system described and detailed in the attached form is eligible for reimbursement and may be installed under the range of conditions under which the original device was tested.  

Please note the following standard provisions that apply to FHWA eligibility letters:


Sincerely yours,

/* Signature of Michael S. Griffith*/

Michael S. Griffith
Director, Office of Safety Technologies
Office of Safety


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Request for Federal Aid Reimbursement Eligibility
Of Highway Safety Hardware

Submitter Date of Request: 02/12/2013 radio button New    Resubmission
Name: Marc Christensen
Company: Off the Wall Products llC dba OTW Safety
Address: 10 W Broadway, Suite 900, Salt lake City UT 84101
Country: USA
To: Michael S. Griffith, Director
FHWA, Office of Safety Technologies

I request the following devices be considered eligible for reimbursement under the Federal-aid highway program.

System Type Submission Type Device Name/Variant Testing Criterion Test Level
'B': Barriers (Roadside, Media) Seleted Radio Button Physical Crash Testing
Radio Button FEA & V&V Analysis
MB350 longitudinal Barrier NCHRP Report 350 TL3

By submitting this request for review and evaluation by the Federal Highway Administration, I certify that the product(s) was (were) tested in conformity with the NCHRP Report 350 (Report 350) and that the evaluation results meet the appropriate evaluation criteria in the Report 350.

Identification of the individual or organization responsible for the product:

Contact Name: Marc Christensen Same as Submitter ☒
Company Name: Off the Wall Products llC dba OTW Safety Same as Submitter ☒
Address: 10 W Broadway, Suite 900, Salt lake City UT 84101 Same as Submitter ☒
Country: USA Same as Submitter ☒


Modification to Existing Hardware Non-Significant – Effect is positive or Inconsequential
Redesigned water cell to allow for blow molding. No change to filled weight or capacity. Changed crash cash to allow quick installation and removal using hitch pins. No change to materials.


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A brief description of each crash test and its result:

Required Test Number Narrative Description Evaluation Results
3-10 (820C) TTl Test No. 270687-YEW8 PASS
S3-10 (700C)    
3-11 (2000P) TTl Test No. 270687-YEW7 PASS
3-20 (820C)    
S3-20 (700C)    
3-21 (2000P)    

Full Scale Crash Testing was done in compliance with MASH by the following accredited crash test laboratory (cite the laboratory's accreditation status as noted in the crash test reports.):

Laboratory Name: Texas Transportation Institute
Laboratory Contact: Dean C. Alberson Same as Submitter ☐
Address: The Texas A&M University System Same as Submitter ☐
Country: College Station TX 77843 USA Same as Submitter ☐
Accreditation Certificate
Number and Date:
Project 270687 (YEW 7 & 8) December 1995


Attach to this form:

  1. 1) A copy of the full test report, video, and a Test Data Summary Sheet for each test conducted in support of this request.
  2. 2) A drawing or drawings of the device(s) that conform to the Task Force-13 Drawing Specifications [Hardware Guide Drawing Standards]. For proprietary products, a single isometric line drawing is usually acceptable to illustrate the product, with detailed specifications, intended use, and contact information provided on the reverse. Additional drawings (not in TF-13 format) showing details that are key to understanding the performance of the device should also be submitted to facilitate our review.

FHWA Official Business Only:

Eligibility Letter AASHTO TF13 Key Words
Number Date Designator
B-34H     water filled barrier, highway kit, off the wall, mb350

Page last modified on June 24, 2011.
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