What does the graded hill sign depict?

Answer: A — truck going down a hill

The graded hill sign is specifically designed to convey important information about the slope of a hill that drivers may encounter on the road. The depiction of a truck going down a hill effectively communicates that a steep or decline slope is ahead. Trucks are often used in this sign because they are significantly impacted by gravity; when going down a hill, they can gain speed quickly, leading to potential safety hazards if drivers are not prepared. Understanding this sign is crucial for drivers to adjust their speed appropriately and manage their vehicle safely while navigating downhill, especially when larger vehicles like trucks are at risk of rolling or losing control. Each element of the sign is intended to alert drivers to the degree of the grade, allowing them to take necessary caution when approaching or traveling down the hill.