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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 .
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).
European traffic signs have been designed with the principles of heraldry in mind; [citation needed] i.e., the sign must be clear and able to be resolved at a glance. Most traffic signs conform to heraldic tincture rules, and use symbols rather than written texts for better semiotic clarity.
Traffic sign design involves any tasks in the process of designing traffic signage. Traffic signs may provide information about the law, warn about dangerous conditions and guide roadway users. Traffic signs vary depending upon their use, using different symbols, colors and shapes for easy identification.
The Vienna Convention on Road Signs and Signals divides the direction, position, or indication sign category into direction signs, which are only those giving distances or directions to a given location; road identification signs (also known as "reassurance signs"), which repeat the name or number of the road, and place identification signs ...
Under the Vienna Convention the begin and end built-up area signs imply a change between built-up area and rural traffic rules including speed limit. In many European countries the dark background with light coloured text version of the sign is intended for information only. [ 16 ]
Traffic-sign (speed limit) recognition. Traffic-sign recognition (TSR) is a technology by which a vehicle is able to recognize the traffic signs put on the road e.g. "speed limit" or "children" or "turn ahead". This is part of the features collectively called ADAS. The technology is being developed by a variety of automotive suppliers to ...
The Traffic Signs Manual [4] is a companion guide to the TSRGD which provides guidance to highway engineers about how and where to use traffic signs, including the size of sign to use (which depends on the speed of vehicles passing the sign).