Warning signs are usually a diamond shape. The color of the sign is yellow in order to caution drivers about an intersection ahead, bicyclists or wildlife that may be near the road.
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It depends entirely on which country you're in !... Here in the UK, warning signs are triangular in shape.
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Getting more out of the metal. Pure economics.
A quadrangle, or quad, is a courtyard that has four sides. It is usually shaped like a rectangle or a square.
Stop signs are usually octagonal, so internal angles are 135°
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