A yellow and black diamond-shaped sign:

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Warns you about work zones ahead.
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Informs you of the speed limit.
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Warns you about potential hazards or changes in road conditions.
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Informs you of upcoming services.
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Explanation
Yellow and black diamond-shaped signs are warning signs that alert drivers to potential hazards or changes in road conditions ahead. They help you prepare for unexpected conditions and adjust your speed or driving behavior accordingly.
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