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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 .
These warning signs indicate that traffic lights are ahead, and are often used when it is difficult to see that a traffic light may already be showing red, to warn a driver to prepare to slow down. They may be supplemented with flashing light or lighted sign when light is red or turning red.
Traffic signs go up when the law requires them, or an engineer does the math and decides it’s the right thing for that location. Show comments. Advertisement. Advertisement.
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.
Sometimes similar signs have minor differences in meanings, following the local traffic codes. For example, the Irish "rural speed limit" sign for local tertiary roads takes the appearance of that used to denote the end of all previously signed restrictions used elsewhere in Europe. However this sign, which is always accompanied with a "SLOW ...
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