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 SS-127
  
  **Hardware Type:**
            Sign Supports, Mailboxes, and Delineator Posts
                          **Code:**
            SS-127
                          **Date:**
            02/23/2005
                          **Testing Criteria:**
            NCHRP 350
                          **Manufacturer:**
            Ultimate Highway Products, Inc.
                          **Device Description:**
            Slip-Mate Slip Base
                          **View PDF:**
            ss127.pdf (1.17 MB)
    
    Skip to contentSkip to contentUnited States Department of Transportation - Federal Highway AdministrationDOT logo
			U.S. Department of Transportation

			**Federal Highway Administration**
			400 Seventh St., S.W.
			Washington, D.C. 20590

**February 23, 2005**

**Refer to: HSA-10/SS-127**

Mr. Nick Calvi
Ultimate Highway Products, Inc.
P. O. Box 7
10650 Fern Avenue
Stanton, California 90680

Dear Mr. Calvi:

Thank you for your letter of October 22, 2004, requesting the Federal Highway Administration (FHWA) acceptance of revisions to your company's Slip-Mate slip base as a breakaway sign support system for use on the National Highway System (NHS). Accompanying your letter were drawings of the proposed changes. You requested that we find the revised Slip-Mate breakaway base acceptable for use on the NHS under the provisions of the NCHRP Report 350 "Recommended Procedures for the Safety Performance Evaluation of Highway Features." You also requested that products formally tested and accepted under the "Western Highway Products" name and sold by your company be recognized as "Ulti-Mate" products.

**Introduction**

Testing of the supports with the original Slip-Mate device was in compliance with the guidelines contained in the NCHRP Report 350, Recommended Procedures for the Safety Performance Evaluation of Highway Features. Requirements for breakaway supports are those in the American Association of State Highway and Transportation Officials' Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals.

**Testing**

The original Slip-Mate was a three-bolt omni-directional slip base system - the revisions do not affect this. The 1/2-inch triangular plates measure 6 inches on each side of the triangle. A 1/2-inch thick polypropylene ball bearing housing is placed between the two plates to provide reduced friction. (This is necessary for a smaller system to avoid the problem of the signpost bending before the slip base can separate.) To either slip plate is welded a 2x2 inch by 1/4-inch square steel tube. The upper tube is 18 inches long and is welded to the top slip plate to receive the 12 gage, 2 1/4 x 2 1/4-inch square perforated square steel sign support. This tube is extended so as to contact the vehicle's bumper with a significant cross-section of steel. The lower tube is 6 inches long and is welded to the bottom plate and is inserted in and fastened to the tube and sleeve combination in the foundation. The slip base bolts are 1/2-inch diameter x 2 1/2-inch long hex head steel bolts with nuts and washers. They are torqued to 40-foot pounds. The anchor for the system consisted of a 2 1/4-inch square, 36-inch long 12 gage perforated square steel tube (PSST) with a 2 1/2-inch square, 18-inch long 12 gage perforated strengthening sleeve with a soil stabilize bracket measuring 13 inches by 10 inches attached with two 5/16-inch corner bolts. The system was installed in the NCHRP Report 350 "Standard" soil. The sign used in the test was a 36 x 60-inch rectangular sign attached to the support post with four 3/8-inch drive rivets. It was mounted 5 inches below the top of the 144-inch tall post. The weight of the sign and the post was 60 pounds above the slip plane. The device was accepted in the FHWA acceptance letter SS-100 dated November 21, 2001.

**Requested Modifications and Findings**

You requested the following modifications to the tested Slip-Mate breakaway device:

Increase the triangular steel plate thickness from 1/2-inch to 5/8-inch
	Cut square holes in the upper and lower plates such that the 2-inch PSST may be inserted half way into the plate. Fillet weld all around on the lower and upper joint areas.
	Weld 1/16-inch thick gasket to 3/8-inch thick gasket in place of adhesive. This will help to keep the stainless steel ball bearings in place.We concur with your assertion that these changes should have no adverse affect on the breakaway performance of the Slip-Safe system. Therefore, the modifications to the devices described above and shown in the enclosed drawings for reference are acceptable for use as Test Level 3 devices on the NHS under the range of conditions tested, when proposed by a State.

**Ulti Mate and Western Highway Products**

Previously your company sold the Slip-Mate and other Ulti-Mate products under the name of "Western Highway Products." You requested that all devices that were accepted under the Western Highway Products name be formally recognized as Ulti-Mate products sold under the company name of Ultimate Highway Products, Inc. The FHWA hereby acknowledges this as it applies to the following acceptance letters issued to Western Highway Products:

SS-100
			November 21, 2001
			Slip Mate breakaway baseSS-62
			June 3, 1996
			Ulti Mate perforated square steel tube sign supportsWZ-155
			June 9, 2003
			Type III BarricadesWZ-155 Revised
			November 28, 2003
			Type III BarricadesPlease note the following standard provisions that apply to the FHWA letters of acceptance:

Our acceptance is limited to the crashworthiness characteristics of the devices and does not cover their structural features, nor conformity with the Manual on Uniform Traffic Control Devices.
	Any changes that may adversely influence the crashworthiness of the device will require a new acceptance letter.
	Should the FHWA discover that the qualification testing was flawed, that in-service performance reveals unacceptable safety problems, or that the device being marketed is significantly different from the version that was crash tested, it reserves the right to modify or revoke its acceptance.
	You will be expected to supply potential users with sufficient information on design and installation requirements to ensure proper performance.
	You will be expected to certify to potential users that the hardware furnished has essentially the same chemistry, mechanical properties, and geometry as that submitted for acceptance, and that they will meet the crashworthiness requirements of the FHWA and the NCHRP Report 350.
	To prevent misunderstanding by others, this letter of acceptance, designated as number SS-127 shall not be reproduced except in full. As this letter and the supporting documentation which support it become public information, it will be available for inspection at our office by interested parties.
	Some UltiMate products are patented devices and considered "proprietary." When proprietary devices are specified by a highway agency for use on Federal-aid projects they: (a) must be supplied through competitive bidding with equally suitable unpatented items; (b) the highway agency must certify that they are essential for synchronization with existing highway facilities or that no equally suitable alternative exists or; (c) they must be used for research or for a distinctive type of construction on relatively short sections of road for experimental purposes. These provisions do not apply to exempt non-NHS projects. Our regulations concerning proprietary products are contained in Title 23, Code of Federal Regulations, Section 635.411, a copy of which is enclosed.
	This acceptance letter shall not be construed as authorization or consent by the FHWA to use, manufacture, or sell any patented device for which the applicant is not the patent holder. The acceptance letter is limited to the crashworthiness characteristics of the candidate device, and the FHWA is neither prepared nor required to become involved in issues concerning patent law. Patent issues, if any, are to be resolved by the applicant.Sincerely yours,

**/Original Signed by Harry W. Taylor/
~for~**
John R. Baxter, P.E.
Director, Office of Safety Design
Office of Safety

3 Enclosures



Safety Home | FHWA Home | Feedback

United States Department of Transportation - **Federal Highway Administration** 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