This road sign means:

This sign indicates that the road can be "slippery when wet". It warns drivers to exercise caution when the pavement is wet due to rain, snow, or sleet. The first half-hour of rain is often the most hazardous because the rain mixes with oils on the road, making the surface exceptionally slick. Slow down when the road is wet, as a wet road surface reduces tire grip, increasing the risk of accidents.

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