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What does a white diamond-shaped sign indicate?

  1. School zone ahead.

  2. Construction zone ahead.

  3. Yield the right-of-way.

  4. Pedestrian crossing ahead.

The correct answer is: Yield the right-of-way.

A white diamond-shaped sign indicates a warning or caution ahead. Option A is incorrect because school zones are usually marked with fluorescent yellow-green signs. Option B is incorrect because construction zones are typically marked with orange signs. Option D is incorrect because pedestrian crossings are marked with yellow-green signs. The correct answer, C, is the only option that matches the description of a white diamond-shaped sign. These signs should not be ignored, as they are used to warn drivers of potential dangers on the road ahead.