Answer :
Final answer:
The traffic sign indicating a '6% Grade' or 'steep grade' warns about a hill or a downgrade on the road, requiring drivers to adjust their speed. Therefore correct option c) A hill or a downgrade up ahead on the road.
Explanation:
The traffic sign that reads "6% Grade" or "steep grade" warns drivers about the slope of the road ahead. Specifically, it indicates that there is a hill or a downgrade up ahead on the road. Such a sign alerts drivers that they may need to adjust their speed and use a lower gear if necessary to safely navigate the slope, especially if the road descends at a steep grade. It is important for safety on the highways as it prepares drivers for potential changes in the driving conditions.
