U.S. Department

of Transportation 400 Seventh St., S.W.

Federal Highway Washington, D.C.

20590

Administration

Refer to: HSA-10/WZ-92

Mr. Henry A. Ross, Director

Sales and Marketing

United Rentals Highway Technologies

880 North Addison Road

P.O. Box 7050

Villa Park, IL 60181-7050

Dear Mr. Ross:

Thank you for your letter of June 6 requesting Federal Highway

Administration (FHWA) acceptance of your company’s AX Barricades with

lights as crashworthy traffic control devices for use in work zones on the

National Highway System (NHS). Accompanying your letter was a report of crash testing

conducted by E-Tech Testing Services along with a video of the test. You requested that we find

this device acceptable for use on the NHS under the provisions of National Cooperative

Highway Research Program (NCHRP) Report 350 “Recommended Procedures for the Safety

Performance Evaluation of Highway Features.”

Introduction

The FHWA guidance on crash testing of work zone traffic control devices is contained in two

memoranda. The first, dated July 25, 1997, titled “INFORMATION: Identifying Acceptable

Highway Safety Features,” established four categories of work zone devices: Category I devices

were those lightweight devices which could be self-certified by the vendor, Category II devices

were other lightweight devices which needed individual crash testing, Category III devices were

barriers and other fixed or massive devices also needing crash testing, and Category IV devices

were trailer mounted lighted signs, arrow panels, etc. The second guidance memorandum was

issued on August 28, 1998, and is titled “INFORMATION: Crash Tested Work Zone Traffic

Control Devices.” This later memorandum lists devices that are acceptable under Categories I, II,

and III.

A brief description of the device for which you are requesting acceptance follows:

The AX Barricade is a MUTCD Type I barricade featuring a single 203 mm wide by 1220 mm

long and 13 mm thick hollow extruded polypropylene plastic panel. The panel, with

retroreflective sheeting, is supported by four 19 mm nominal size Electrical Metallic Tubing

(EMT) legs. The legs are connected to the panel with 9.5 mm diameter ASTM A307 hex bolts

and locknuts using an arrangement of springs and steel channels that allow each leg to be pivoted

up for storage and transport. The steel channels in the pivot arrangement fasten to the panel with 
2

6.35 mm diameter ASTM Grade 5 hex bolts and lock washers. When deployed the top edge of

the panel is a nominal 914 mm above the ground. The tested AX barricades were tested with

ToughLite 2000 warning lights using a standard tamper-proof warning light bolt. A flat washer

was used between the head of the bolt and the panel. The mass of the barricade with light was 

6.1 kg. 

Testing

Full-scale automobile testing was conducted on your company’s devices. Two

stand-alone examples of the device were tested in tandem, one head-on and

the next placed six meters downstream turned at 90 degrees, as called for in

our guidance memoranda. The complete device as tested is shown in

Enclosure 1.

The crash test is summarized in the table below:

Test Number 05-3721-010

Test Article AX Barricade

Height to Bottom of

Panel

711 mm

Height to Top of Panel 914 mm

Flags or lights One ToughLite 2000

Test Article Mass

(each)

6.1 kg

Vehicle Inertial Mass 825 kg

Impact Speed, Head-on 104.7

Impact Speed, 90 Deg. 103.9

Velocity Change, Headon0.2 m/s

Velocity Change, 90

deg.

0.25 m/s

Vehicle crush Moderate damage to bumper, grille, and

hood

Occupant Compart.

Intrusion

None

Windshield Damage None

Findings

Damage was limited to moderate damage to the bumper, grille, and hood. Although the light

separated from the barricade it either glanced off the windshield or did not contact it at all.

The results of the testing met the FHWA requirements and, therefore, 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.
3

Please note the following standard provisions which apply to 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 FHWA and

NCHRP Report 350. 

! To prevent misunderstanding by others, this letter of acceptance, designated as number

WZ-92 shall not be reproduced except in full. This letter, and the test documentation upon

which this letter is based, is public information. All such letters and documentation may

be reviewed at our office upon request.

! United Rentals work zone traffic control devices may include patented components and if

so are considered "proprietary." The use of proprietary work zone traffic control devices

in Federal-aid projects is generally of a temporary nature. They are selected by the

contractor for use as needed and removed upon completion of the project. Under such

conditions they can be presumed to meet requirement "a" given below for the use of

proprietary products on Federal-aid projects. On the other hand, if proprietary devices are

specified for use on Federal-aid projects, except exempt, non-NHS 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. Our regulations concerning proprietary products are contained in

Title 23, Code of Federal Regulations, Section 635.411, a copy of which is enclosed. 

 

Sincerely yours,

Frederick G. Wright, Jr.

Program Manager, Safety 

Enclosure