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Traffic signs are divided into three basic categories: regulatory, warning, and guide signs. The shape of a traffic sign communicates important information about the sign's message. In poor visibility conditions, such as heavy fog, you may be able to make out only the shape of a sign. The following section will give you an understanding of the signs that are commonly used on the US roads. Neglecting to obey the road signs results in a traffic violation, but to obey the sign, everyone on the road, regardless of whether you are a pedestrian or a driver, needs to know the meaning of each specific sign. Read the following section to get to know how they differ from each other by the color and shape.