All commercial vehicles tend to pick up speed on downgrades. The most important task a driver has concerning speed on downgrades is to select and keep a speed that is safe and not too fast for:

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Gravity will cause all commercial vehicles to pick up speed on a downgrade. The amount of extra speed depends on the degree of slope, length of slope, and weight of the vehicle and its cargo. Slopes with a higher degree of downgrade will cause acceleration to occur more quickly. Longer downgrades will offer the vehicle more time to pick up speed. Road conditions and weather can play a major role in how safe or dangerous a downgrade is at any speed.

All Commercial Vehicles Tend to Pick Up Speed on Downgrades