This symbol is used for:

A slow-moving vehicle symbol has an orange fluorescent center and red reflective borders, and indicates a slow-moving vehicle which cannot travel faster than 25 mph. When you see this emblem on the back of a vehicle, slow down and maintain a safe following distance that allows for a clear field of vision. When it's safe to do so, you may pass the slow-moving vehicle, but exercise caution while overtaking.

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