What is the most contributing factor to a CMV rollover when entering a curve?

Speed is the most significant contributing factor to a commercial motor vehicle (CMV) rollover when entering a curve due to the physics involved in navigating turns. When a CMV is traveling too fast for the conditions of the curve, the centripetal force required to keep the vehicle on its intended path increases. If this force exceeds the vehicle's stability threshold, it can lead to a loss of control and result in a rollover.

In curves, especially those that are sharp or have uneven surfaces, the relationship between speed and the vehicle's center of gravity becomes critical. A higher speed not only increases the lateral forces acting on the vehicle but also affects how the weight is transferred across the axles and from side to side. This transfer can make the vehicle more prone to tipping over, particularly if the cargo is not evenly distributed or if the vehicle is unbalanced.

While factors such as the weight of the cargo, truck type, and road conditions do play a role in vehicle stability, managing speed is the most effective way to prevent a rollover. Speed limits, particularly in curves, are designed to ensure that vehicles can navigate safely without exceeding their stability limits.