What is the most important factor in preventing a rollover?

Answer: B — Proper weight distribution and maintaining a low center of gravity

The most important factor in preventing a rollover is proper weight distribution and maintaining a low center of gravity. This is crucial because a vehicle's stability is greatly influenced by how its weight is distributed. When a truck or trailer is loaded unevenly, it can cause one side to be heavier than the other, increasing the risk of tipping over, especially during sharp turns or sudden maneuvers. A low center of gravity also contributes to a vehicle's stability. When the center of gravity is low, the vehicle is less likely to tip over, as there is less leverage acting on it during changes in direction. This is particularly important for large vehicles like trucks and buses, which have a higher risk of rollover compared to standard passenger vehicles. While wider tires can provide better traction, they do not inherently lower the center of gravity or improve weight distribution. Driving under the speed limit is a good practice for safety, but controlling speed alone does not address the mechanical factors that lead to rollovers. Lastly, regularly changing brake pads is crucial for stopping power, but it does not prevent rollovers. Overall, the combination of weight distribution and a low center of gravity is the most effective approach to minimizing the risk of rollovers.