Final answer:
A round, black on yellow warning sign typically indicates a reduced speed/work zone warning.
Explanation:
A round, black on yellow warning sign typically indicates a reduced speed/work zone warning. This sign is used to alert drivers to an upcoming area where they need to slow down for safety reasons, such as road work or other potential hazards.
For example, such a sign might be placed before a construction zone or an area with heavy pedestrian traffic to remind drivers to proceed with caution and be prepared to slow down or stop if necessary.
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