Project: IMX-35-5(177)02


Polk County


Des Moines RCE Office

P.O. Box 4043

Highland Park Station

Des Moines, Iowa 50333


Dear RCE:


This letter is to document that all temporary traffic control signs and devices used on the referenced project are NCHRP 350 compliant per Iowa DOT specification article 2528.01, A.


Traffix Devices self-certification letter for their Category I drums is attached.  FHWA approval memorandums for the Category II signs and devices include the following:

WZ-46, WZ-99, WZ-111, and WZ-117.


Upon request, I will supply copies of the above documents.



Yours truly,



John Q. Owner