This warning sign:

The Speed Reduction sign is a warning sign that alerts drivers they are approaching an area where the posted speed limit will soon be reduced for safety. It is also known as “Reduce Speed Ahead” or “Speed Zone Ahead” sign.
When you see this sign, you should begin slowing down gradually and be prepared to comply with the lower speed limit once you reach the next posted speed limit sign.
The reduced speed limit does not begin at the warning sign. It begins at the next speed limit sign you see.
Failing to slow down in time can result in a traffic violation or increase your risk of a crash, especially in areas with curves, intersections, school zones, or heavy pedestrian traffic. Use this advance warning to adjust your speed safely and smoothly.

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