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The MUTCD is published by the FHWA under federal regulations, specifically 23 Code of Federal Regulations (CFR), Part 655, Subpart F. This manual governs how signs, signals, and markings are implemented to keep road users moving safely. When analyzing unusual guide signs or directional claims, keep in mind that official signs must adhere to these federal standards. Comparing unusual signs against official templates can help identify non-compliant or fabricated designs.
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