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Multiple Choice

Which shapes are used for warning signs?

Warning signs are designed to grab your attention and alert you to hazards ahead, so their shape is the first clue about their purpose. The diamond shape is the classic signal for a warning, because its bright, angular form stands out and signals you to slow down or be prepared for something ahead. Rectangular signs are also used in some places to convey warning information when more room is needed for text or for specific warnings that are displayed on a rectangular panel. The other shapes—circle, triangle, pentagon, hexagon—are associated with different types of signs (regulatory, yield, school zones, etc.), not standard warning notices. So the shapes used for warning signs are diamond, and sometimes rectangle.

Warning signs are designed to grab your attention and alert you to hazards ahead, so their shape is the first clue about their purpose. The diamond shape is the classic signal for a warning, because its bright, angular form stands out and signals you to slow down or be prepared for something ahead. Rectangular signs are also used in some places to convey warning information when more room is needed for text or for specific warnings that are displayed on a rectangular panel. The other shapes—circle, triangle, pentagon, hexagon—are associated with different types of signs (regulatory, yield, school zones, etc.), not standard warning notices. So the shapes used for warning signs are diamond, and sometimes rectangle.