Which type of vehicle requires extra caution when driving downhill?

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When driving downhill, large trucks and buses require extra caution due to their size and weight. These vehicles have a greater mass, which means they can gain speed quickly when traveling downhill. The momentum from their weight can make it more challenging to control them, especially if the brakes overheat or if a quick stop is needed. Additionally, larger vehicles have longer stopping distances compared to lighter vehicles, meaning they need more time and distance to come to a complete stop.

The design of large trucks and buses often includes air brakes, which can take longer to activate than standard hydraulic brakes found in smaller vehicles. As such, drivers must remain vigilant about the conditions of the road, their own speed, and the capacity of their vehicle to safely navigate downhill stretches.

In contrast, compact cars, motorcycles, and vans are generally easier to control and stop on downhill grades, thus do not demand the same level of caution as large trucks and buses when managing downhill driving situations.