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11th edition of the MUTCD, published December 2023. In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS).
Traffic signs or road signs are signs erected at the side of or above roads to give instructions or provide information to road users. The earliest signs were simple wooden or stone milestones . Later, signs with directional arms were introduced, for example the fingerposts in the United Kingdom and their wooden counterparts in Saxony .
The Manual on Uniform Traffic Control Devices for Streets and Highways (usually referred to as the Manual on Uniform Traffic Control Devices, abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the United States Department of Transportation (USDOT) to specify the standards by which traffic signs, road surface markings, and signals are designed, installed ...
Regulatory provisions exist for extra-large 45-inch (110 cm) signs with 16-inch (41 cm) legend and 1 + 3 / 4 -inch border for use where sign visibility or reaction distance are limited, and the smallest permissible stop sign size for general usage is 24 inches (61 cm) with an 8-inch (20 cm) legend and 5 / 8 -inch (1.5 cm) border. [6]
The Traffic Signs Manual is a companion guide to the TSRGD which sets out dimensions and other details for using the authorised signs and markings. [3]
Amendments, including new provisions regarding the legibility of signs, priority at roundabouts, and new signs to improve safety in tunnels were adopted in 2003. Both the Vienna Convention and the Geneva Protocol were formed according to consensus on road traffic signs that evolved primarily in 20th century continental Western Europe. In order ...