Practice Quiz

Commercial Driver's License

Category - Basic Operation

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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:
  1. The weight of the vehicle as well as the cargo being hauled
  2. The steepness of the downgrade
  3. The length of the downgrade
  4. Weather and road conditions
  5. All of the above
Explanation
Answer: E - 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.
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