What does a sign indicating the road is slippery when wet recommend?

A sign indicating that the road is slippery when wet recommends slowing down primarily because wet conditions can significantly reduce a vehicle's traction on the road surface. When water mixes with oils and other substances on the pavement, it creates a slippery condition that can lead to loss of control over the vehicle, including the risk of skidding.

By reducing speed, a driver has more time to react to any potential hazards and is better able to maintain control of the vehicle. This allows for greater stopping distances and helps prevent accidents. In addition to slowing down, drivers should be more cautious with their steering and braking and increase their following distance to account for these hazardous conditions.