Signs were written in the local language ( example) symbolic signs, though long used on certain tradesmen's signs (like the pawnbrokers' tri-ball symbol) were to be used for traffic only much later in history.Ĭomplex signage systems emerged with the appearance of motorcars. The early signs did not have high-contrast lettering and their messages might have been easily overlooked. Hazard warnings were rare though occasional specimens appeared, such as the specific warning about horse-drawn vehicles backing up which was carved in stone in Lisbon's Alfama neighborhood in 1686. Some of the first roadside signs-ancient milestones-merely gave distance measures. Pre-standardization British School Zone with metal-cutout generic Warning symbol embellished with red glass reflector-spheres. In the United States they are based on the MUTCD standard and often contain text only. In Europe they are based on the UNECE Vienna Convention on Road Signs and Signals. The warning signs usually contain a symbol. Some other countries also use these standards for some signage. In the United States, Canada, Mexico, Thailand, Australia, Japan, Indonesia, Malaysia, New Zealand, most of South America, and also the Republic of Ireland (diverging from the standards of the rest of Europe) use warning signs are black on a yellow background and usually diamond-shaped, while temporary signs (which are typically construction signs) are black on an orange background. Warning signs in some countries have a diamond shape in place of the standard triangular shape. Some countries (like France, Norway and Spain) that normally use a white background have adopted an orange or amber background for road work or construction signs. The polar bear warning sign in Svalbard recently changed from displaying a black bear on white background to a white bear on black background (both signs are triangular with a red border).
In Sweden, Serbia, Bosnia and Herzegovina, Greece, Finland, Iceland, North Macedonia and Poland, they have a red border with an amber background.
In the People's Republic of China (except for Macau and Hong Kong), they appear with a black border and a yellow background. While warning traffic sign designs vary, they usually take the shape of an equilateral triangle with a white background and thick red border. Some are traffic signs that indicate hazards on roads that may not be readily apparent to a driver. A warning sign is a type of sign which indicates a potential hazard, obstacle, or condition requiring special attention.
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