What action should you take when encountering a loaded semi-truck on a downgrade?

When encountering a loaded semi-truck on a downgrade, it is essential to be prepared to reduce speed or stop as needed. This situation presents a unique set of challenges due to the weight and momentum of the truck. Loaded semi-trucks are significantly heavier and have longer stopping distances compared to lighter vehicles, especially when they are moving downhill. As they descend, the truck may pick up speed rapidly, which could lead to a dangerous situation if the driver is not able to control their speed effectively.

By being prepared to adjust your speed or stop if necessary, you increase your awareness of the truck's potential behavior and create a safer driving environment for yourself and everyone on the road. It is critical to keep a safe following distance and to stay alert to any changes in the traffic situation, especially when large vehicles are involved.

The other options suggest actions that may lead to unsafe conditions, such as accelerating past the truck, which could increase the risk of a collision if the truck begins to lose control or requires more stopping distance. Similarly, maintaining current speed might not be sufficient, as adjustments may be necessary. Continuously sounding the horn could also distract or alarm the truck driver without contributing to road safety.