Safety Eligibility Letter WZ - 281

U.S. Department of Transportation
Federal Highway Administration

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

July 1, 2009

In Reply Refer To: HSSD/WZ-281

Ms. Glenda Bleau
Sales Supervisor
MDI Traffic Control Products
38271 W. Twelve Mile Rd
Farmington Hills, MI 48331-3041

Dear Ms. Bleau:

In your letter of April 30 you requested the Federal Highway Administration (FHWA) acceptance of MDI’s model 50TRI tri-pod temporary sign stand as a crashworthy traffic control device for use in work zones on the National Highway System. You requested acceptance of the temporary sign stand for use with the following sign substrate material: 1/2 inch thick plywood. Your request for acceptance is based on the performance of the generic tri-pod sign stand accepted in FHWA letters WZ-240 and a similar tri-pod stand in WZ-207. Accompanying your letter were the FHWA Office of Safety Design forms that included a drawing and a detailed description of the 50TRI. The drawing of the 50TRI is enclosed for reference. You requested that we find the 50TRI acceptable for use as a Test Level 3 device on the NHS under the provisions of the National Cooperative Highway Research Program Report 350 "Recommended Procedures for the Safety Performance Evaluation of Highway Features”.

This letter acknowledges FHWA's acceptance of your request. The original completed forms have been modified by the addition of the FHWA acceptance letter number and the date of our review. The forms will be posted on our Web site in the near future.

Enclosures