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Some signs can be localized, such as No Parking, and some are found only in state and local jurisdictions, as they are based on state or local laws, such as New York City's "Don't Block the Box" signs. These signs are in the R series of signs in the MUTCD and typically in the R series in most state supplements or state MUTCDs.
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 .
Similar to road signs of Poland and Greece, road signs are triangular, have a yellow background and a red border. Like other countries, the signs use pictograms to display their meaning. Road signs in North Korea differ by locale.
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. In Other News.
A white background signifies the sign is permanent, while a yellow background signifies that the sign is temporary. Warning signs are an upwards-pointing red triangle and contain a black pictogram describing the danger or obstruction. Speed limit signs are a red circle with the limitation in black. South Africa drives on the left.
These signs are often temporary in nature and used to indicate road work (construction), poor roads, or temporary conditions ahead on the road including flagmen, uneven pavement, etc. (Note that some "high water" signs are posted to alert drivers of a flood-prone area and do not actually mean that there is a flooded section of road ahead.)