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
                Keep Vehicles on the Road
                Provide for a Safe Recovery
                Reduce Crash Severity
                Focus on Reducing Rural Roadway Departures (FoRRRwD)
                
                Archived Hardware Eligibility Letters – NCHRP 350
These letters are archived and are posted for "historical and research purposes only" per the sunset dates in the AASHTO/FHWA Joint Implementation Agreement and exceptions to these dates as posted on the AASHTO Committee on Design website.SearchHardware Type
                    
- Any -Barrier Terminals and Crash CushionsLongitudinal Barriers and Bridge RailsLuminaire SupportsSign Supports, Mailboxes, and Delineator PostsWork Zone DevicesStart DateEnd Date
    Letter
																								Date
																								Testing
																								ManufacturerSort descending
																								Hardware Type
																								Device DescriptionLS-02
																																				June 29, 1988
																																				NCHRP 350
																																				Akron Foundry
																																				Luminaire Supports
																																				TB Series AL Transformer (TB1-AF 1315-17 and modifications) (See ls4)LS-57
																																				April 19, 2003
																																				NCHRP 350
																																				Akron Foundry
																																				Luminaire Supports
																																				TB1-17 breakaway cast aluminum transformer baseLS-56
																																				November 13, 2003
																																				NCHRP 350
																																				Akron Foundry
																																				Luminaire Supports
																																				T-Base breakaway cast aluminumLS-55
																																				November 13, 2005
																																				NCHRP 350
																																				Akron Foundry
																																				Luminaire Supports
																																				TB2-17 breakaway cast aluminum transformer baseLS-53
																																				June 6, 2002
																																				NCHRP 350
																																				Akron Foundry
																																				Luminaire Supports
																																				TS-1000 Threaded Traffic Signal Pedestal Base and TS-1000 Modified Threaded Traffic Signal Pedestal BaseLS-24
																																				July 22, 1991
																																				NCHRP 350
																																				Akron Foundry
																																				Luminaire Supports
																																				Revisions to TB-1, TB-2, TB-3 Cast aluminum transformer basesLS-47
																																				November 19, 1997
																																				NCHRP 350
																																				Akron Foundry
																																				Luminaire Supports
																																				TS-1000 and TS-1000Modified threaded traffic signal basesLS-22
																																				September 19, 1990
																																				NCHRP 350
																																				Akron Foundry
																																				Luminaire Supports
																																				Chart summarizing approval letters ls2, ls4, ls9, ls15, ls19LS-19
																																				August 6, 1990
																																				NCHRP 350
																																				Akron Foundry
																																				Luminaire Supports
																																				TB-3-17, TB-5-9, TB-6-9 Transformer Bases, 11.5 to 15.5" BCLS-18
																																				August 6, 1990
																																				NCHRP 350
																																				Akron Foundry
																																				Luminaire Supports
																																				F-1300 and F-1302 Al Transformer Bases (tests of Pole Lite bases)
  Pagination
    «
            « First
                          ‹
            ‹‹
                                      1
              2
              3
              4
              5
              6
              7
              8
              9
                                      ›
            ››
                          »
            Last » 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