Final answer:
This road sign indicates that there is a steep hill ahead.
Step-by-step explanation:
This road sign indicates that there is a steep hill ahead. It is important for drivers to be aware of this because it could require them to adjust their speed and gear ratio to safely navigate the hill.
The sign is typically yellow with a black symbol of a hill that has a upward diagonal line to represent the steepness of the hill. This sign is commonly seen on mountainous roads or areas with significant elevation changes.