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They are referred to as "diamond-shaped". Geometrically, however, most US traffic warning signs are actually squares that have been rotated 45 degrees from horizontal, rather than diamonds, which have no right angles.

Read more: What_shape_are_the_road_signs_that_give_warning

In other countries, road construction and other warning signs are generally triangular with a white or yellow background and a red border.

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Q: What shape is a road construction sign?
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