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==External links==
* [http://mutcd.fhwa.dot.gov/ U.S. FHWA Manual on Uniform Traffic Control Devices]
* [http://tcd.tamu.edu/documents/MUTCD_History.htm MUTCD History] (Texas Transportation Institute)
* [http://www.trafficsign.us/ US traffic signs]
* [http://www.triskele.com/fonts/
* [http://www.ncutcd.org/ National Committee on Uniform Traffic Control Devices (NCUTCD)]
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