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Grades K–2 · Societies

Why are some sidewalk tiles covered in bumps?

Near some crossings, the smooth sidewalk changes into a patch of raised bumps. These bumps are there on purpose. A person may feel the change underfoot or with a long cane.

W006 visual explanationTexture gives information about a place; sidewalk; warning patch; crossing; Cane or feet can notice a changed surface; The bumps mark a location; they do not say traffic has stopped.Texture gives information about a placesidewalkwarning patchcrossingCane or feet can notice a changed surfaceThe bumps mark a location; they do not say traffic has stopped.

In the diagramTexture gives information about a placesidewalkwarning patchcrossingCane or feet can notice a changed surfaceThe bumps mark a location; they do not say traffic has stopped.

Raised bumps mark a change near a crossing. The surface gives a location clue, not permission to cross.

The changed surface gives a clue that an important edge is near. It can help someone who cannot see the edge clearly. A different color can make the patch easier to notice with vision too.

The bumps do not say when traffic has stopped. They give information about the place. Street signals, the shape of the crossing and other clues help people understand different parts of the journey.

About this explanation

Starting knowledge: Recognize a sidewalk, a crossing and a change in surface texture.

Connect this idea: Living Systems & Mind

Sources

  • U.S. Access Board — Public Right-of-Way Accessibility Guidelines: Detectable Warning Surfaces
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