Final answer:
A Hill or Incline warning sign alerts drivers to slow down for a sharp rise in the roadway, and these are typically yellow with a black illustration of a steep hill.
Step-by-step explanation:
The type of sign that warns drivers to slow down for a sharp rise in the roadway is known as a Hill or Incline warning sign. These signs are typically yellow with a black illustration of a steep hill on them, indicating that drivers should reduce their speed and be prepared for a potential change in road conditions ahead. Recognizing and understanding such signs is crucial for maintaining safety on the roadway, as they alert drivers to upcoming hazards or changes in the driving environment.