Which statement about certain types of cargo is correct?

The statement that unstable loads require extra caution on curves is correct because such loads can shift or move during turns or changes in direction, leading to potential loss of control or tipping of the vehicle. When transporting cargo that is not securely positioned or has a high center of gravity, the forces acting on the load can result in serious handling issues. Drivers must recognize this risk and take appropriate precautions, such as reducing speed and ensuring the load is properly secured, especially when navigating curves.

In contrast, the assertion that all cargo is stable is not accurate, as various types of cargo can have different levels of stability based on their shape, weight distribution, and securing methods. The idea that cargo loading does not affect driving is also misleading because the way cargo is loaded can significantly impact a vehicle's balance and handling characteristics. Lastly, while stable cargo is generally safer than unstable cargo, it does not guarantee safety under all circumstances, as other factors such as weather, road conditions, and driver performance also play crucial roles in roadway safety.