USA Banner
  U.S. flag
              An official website of the United States government Here's how you knowOfficial US Government Icon
              **Official websites use .gov**A **.gov** website belongs to an official government organization in the United States.
            Secure Site Icon
              **Secure .gov websites use HTTPS**
                  A **lock** ( A locked padlock ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. 
 U.S. Department of Transportation Icon United States Department of Transportation
 Search DOT
            Search
                    About FHWAFHWA Organization
                Headquarters Offices
                Field Offices
                Strategic Plan
                Business Opportunities
                Staff Directories
                Careers
                Highway History
                Contact UsProgramsAcquisition Management
                Civil Rights
                Federal Lands Highway
                Infrastructure
                Innovative Program Delivery
                Operations
                Planning, Environment, and Realty
                Policy
                Research, Development, and Technology
                Safety
                Browse by TopicsResourcesCore Highway Topics
                Federal Aid Essentials
                Automation
                Complete Streets
                Laws and Regulations
                Policy & Guidance Center
                Section 508
                Publications and Statistics
                Professional Development
                National Highway Institute
                Resource Center
                Accessibility Resource Library
                FHWA Research LibraryNewsroomPress Releases
                Speeches & Testimony
                Photos
                Videos
                Media ContactsMenu FHWA Highway Safety Programs Home
                        Safety
                        Roadway Departure Safety
                        Reduce Crash Severity
                        Hardware Eligibility Letters


            
            In This Section
        Roadway Departure Safety
                Strategic Approach
                                Strategic Plan
                Crash Emphasis Brochures
                Focused Approach
                Noteworthy Practices
                Partner Resources
                Keep Vehicles on the Road
                                Pavement Friction
                Horizontal Curve Safety
                Rumble Strips and Rumble Stripes
                Nighttime Visibility
                Provide for a Safe Recovery
                                SafetyEdge
                Clear Zones
                Reduce Crash Severity
                                Overview
                Hardware Eligibility Letters
                Focus on Reducing Rural Roadway Departures (FoRRRwD)
                                Overview
                All Public Roads
                Proven Countermeasures
                Systemic Approach
                Safety Action Plans
                FoRRRwD Resources
                
                Safety Eligibility Letter B-105
  
  **Hardware Type:**
            Longitudinal Barriers and Bridge Rails
                          **Code:**
            B-105
                          **Date:**
            09/05/2002
                          **Testing Criteria:**
            NCHRP 350
                          **Manufacturer:**
            Nebraska Department of Roads
                          **Device Description:**
            Thrie-beam transition @ TL-3
                          **View PDF:**
            b105.pdf (853.36 KB)
    
    
September 5, 2002
HSA-10/ B105
Phil TenHulzen, P.E.
  Standard Plans Engineer
  Nebraska Department of Roads
  PO Box 94759
  Lincoln, NE 68509-4759
Dear Mr. TenHulzen:
In response to your e-mail request last May, please be advised that the Nebraska 
  Bridge Approach Section described in the Texas Transportation Institute's report 
  entitled “NCHRP Report 350 Test 3-21 of the Nebraska Thrie-Beam Transition” 
  may be considered a test level 3 (TL-3) transition design and used on the National 
  Highway System when such use is acceptable to the contracting agency.
Your non-proprietary design consists of 3810 mm of nested 12-gauge Thrie-beam 
  supported on two W150 x 37 x 2591-mm long steel posts, followed by four 150W 
  x 22 x 2134-mm long steel posts.  The first post from the bridge is 1220 mm 
  from the concrete parapet and the next four posts are on 952-mm centers.  A 
  similar design using 250 x 250 x 2591-mm long wood posts and 200 x 200 x 2135-mm 
  long wood posts for their steel post counterparts is also acceptable.  A TS 
  102 x 102 x 7.9 steel tube spans the gap between the bridge end and the first 
  post and connects to each with special steel brackets.  This tube is used to 
  support a wood offset block centered approximately 300 mm from the end of the 
  concrete parapet.  These and other details are included in the enclosed test 
  report.
The enclosed test report indicates that a “pipe spacer” between the concrete 
  parapet and the nested Thrie-beam elements was crushed 25 mm in the test.  As 
  can be seen in the photographs, and as you later verified, your design does 
  not incorporate a spacer.  However, the end of the parapet was damaged in the 
  crash and there was significant snagging on the concrete underneath the Thrie-beam 
  rail.  Nevertheless, all Report 350 evaluation criteria were met as noted on 
  the test results summary sheet included in the report.
I understand that CAD drawings of this design are available through your office 
  upon request and that you can be contacted directly via e-mail at ptenhulz@dor.state.ne.us.
Sincerely yours,
(original signed by Carol H. Jacoby)
Carol H. Jacoby, P.E.
  Director, Office of safety design
Enclosure U.S. DEPARTMENT OF TRANSPORTATION

**Federal Highway Administration**

1200 NEW JERSEY AVENUE, SE

WASHINGTON, DC 20590

202-366-4000Subscribe to email updates
                    About
  

        
              About FHWA
                Careers
                Org Chart
                Staff Directories
                Work with UsPrograms
  

        
              Acquisition Management
                Civil Rights
                Federal Lands Highway
                Infrastructure
                Innovative Program Delivery
                Operations
                Planning, Environment, and Realty
                Policy
                Research, Development, and Technology
                SafetyPolicies, Rights, Legal
  

        
              About DOT
                Accessibility
                Budget and Performance
                Civil Rights
                FOIA
                Information Quality
                No FEAR Act
                Office of Inspector General
                Privacy Policy
                USA.gov
                Web Policies and Notices
                Web StandardsNews & Events
  

        
              Newsroom
                Press Releases
                Speeches & Testimony
                Media Contacts
                Connect with Us