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The Manual on Uniform Traffic Control Devices (MUTCD) defines the national standards used by road managers to install and maintain traffic control devices on all streets, highways, and pedestrian facilities. Published by the Federal Highway Administration (FHWA), it is a compilation of standards for road markings, highway signs, and traffic signals, updated periodically to address changing transportation needs and new safety technologies.
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Sources
en.wikipedia.org shapes more of what AI says about Manual on Uniform Traffic Control Devices (MUTCD) than any other source, at 100% of its citations.