Final answer:
The correct answer is d. b. and c. Truck drivers should heed 'Truck Advisory' speed limits and check their brakes when necessary, ensuring safe traveling down steep hills.
Step-by-step explanation:
Truck drivers should b. Heed "Truck Advisory" speed limits when traveling down steep hills, and c. Pull over and check their brakes when required. Therefore, d. b. and c. are correct. It's important for drivers, especially those operating large vehicles like trucks, to follow these guidelines for safe traveling. Avoiding steep hills altogether is not practical or necessary, but paying close attention to advisory speed limits and ensuring that their vehicle's brakes are functioning properly are crucial steps in preventing accidents and maintaining road safety.
In the context of the given information regarding a truck descending a hill, drivers would not avoid the hill but would use caution and check their equipment. The question about a car accelerating or a person standing up from a seated position highlights that motion and forces are involved in both scenarios. The specifics about the Appalachians, measuring stopping distances, and acceleration are related to the physics of motion, which also plays a significant role in safe driving practices for truck drivers.