CDL Vehicle Combination Practice Test

In general, what is the implication of a higher center of gravity for trucks?

1. Harder to steer

2. Easier to turn over

3. Increased fuel efficiency

4. Better stability

The correct answer is: Easier to turn over

A higher center of gravity in trucks significantly impacts their stability, particularly in terms of the risk of rolling over. When the center of gravity is elevated, it increases the likelihood of the vehicle tipping over during sharp turns, sudden maneuvers, or when driving on uneven surfaces. This is because the higher center of gravity creates a greater moment arm—the distance from the center of gravity to the point of contact with the ground, which affects how forces are distributed during movement. Consequently, a truck with a higher center of gravity will experience more lateral forces that can shift the weight of the vehicle. If these forces exceed the vehicle's stability threshold, it can result in a rollover accident. This is particularly crucial for drivers to understand when navigating curves or handling heavy loads, as it affects how they should adjust their driving behavior to maintain safety. The other options do not accurately reflect the implications of a higher center of gravity. For example, while a high center of gravity can complicate steering, it does not inherently make steering harder. Increased fuel efficiency is generally associated with well-designed aerodynamics and load distribution, not directly impacted by the vehicle's center of gravity. Similarly, better stability would typically be associated with a lower center of gravity, which enhances a vehicle