Which sign warns you to slow down for a sharp rise in the roadway?

The sign that warns you to slow down for a sharp rise in the roadway is the bump warning sign. This sign is specifically designed to alert drivers to the presence of a bump in the road, which can cause vehicles to jolt or lose control if they are traveling at higher speeds. By signaling drivers to reduce their speed, the bump sign promotes safety and helps prevent accidents that could occur due to sudden changes in road height.

In contrast, the other signs listed serve different purposes: the winding road sign indicates that the road will have curves, the steep hill sign advises drivers of a significant incline or decline that may affect their vehicle's performance, and the slippery when wet sign alerts drivers to potential traction issues under wet conditions. Each of these signs communicates important information about road conditions, but in this case, the bump warning sign is the one directly related to warning about a rise in the roadway.