What is advised when driving behind a truck on an incline?

When driving behind a truck on an incline, it is advised to keep a greater distance because trucks often have difficulty maintaining their speed on slopes. Trucks are typically heavier and their engines may struggle against the gravitational pull of an incline, leading to a decrease in speed. This slower pace can affect the overall flow of traffic, and having a greater distance allows for a safer reaction time if the truck does slow down significantly or unexpectedly. Maintaining this distance is particularly important when navigating grades or hills, as it helps ensure that you have enough space to respond to any changes in the truck's speed or position.