What type of 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 a bump warning sign. This sign indicates that there is an uneven surface ahead, which may require drivers to reduce speed to navigate the area safely. Bumps can be sudden and significant, hence the warning is crucial for safe driving, as it prompts motorists to prepare for an abrupt change in the roadway.

In contrast, other options describe different situations. For example, a curve ahead sign warns drivers about a turn in the road, a hill crest sign is meant to alert drivers about the approach to the top of a hill where visibility might be limited, and a steep grade sign indicates a significant incline or decline on the roadway. Each of these signs serves a specific purpose, whereas the bump warning sign focuses specifically on advising drivers to slow down due to a sharp rise, making it the most appropriate choice in this context.