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U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE.
Washington, D.C. 20590
January 31, 2008
In Reply Refer To: HOTO-1
Mr. Ernest D. L. Huckaby
MUTCD Consultant Services
13402 Caribou Court
Fort Washington, MD 20744
Dear Mr. Huckaby:
Thank you for your letter of January 6 requesting an interpretation regarding the use of light emitting diodes (LEDs) in regulatory and warning signs and requesting a change to add additional language to the Manual on Uniform Traffic Control Devices (MUTCD) to clarify the current language for the application of LEDs.
Your request to change the MUTCD is of interest to the Federal Highway Administration (FHWA) and will be added to the docket comments for the Notice of Proposed Amendments (Docket No. FHWA-2007-28977). Please note that the following change was proposed to Section 2A.07 for the application of LEDs:
A module of multiple LED units used as a closely-spaced, single light source shall only be used within the sign face
for if contained within the legend s or within the symbol s.
Except for the STOP/SLOW paddles (see Section 6E.03) used by flaggers and the STOP paddles (see Section 7D.05) used by adult crossing guards, neither individual LED pixels nor groups of LEDs shall be used within the background area of a sign.
In response to your request for an interpretation of Section 2A.08 to clarify the color of LEDs the following is provided:
I hope this information satisfactorily addresses your inquiry. We have assigned the following official ruling number to your request: "2-638 (I) - Color of Light Emitting Diodes (LEDs)." Please refer to this number in any future correspondence. If we can be of further assistance on this matter, please contact Mr. Fred Ranck at 708-283-3545.
/s/ Robert Arnold
Director, Office of Transportation Operations
United States Department of Transportation - Federal Highway Administration