When is there a particularly high risk of a combination vehicle jack-knifing or skidding on a slippery road?

You chose the correct answers. A combination vehicle—such as a car with a trailer or a truck with a semitrailer—has a higher risk of jack-knifing or skidding on slippery roads if the driver steers abruptly or applies maximum braking force while turning. Both of these actions can cause loss of control because the trailer can push sideways, especially if the tires lose grip. Gradual acceleration, on the other hand, does not increase the risk in this scenario. So remember: On slippery roads, it is important to avoid sudden movements and harsh braking, particularly when you are steering through a curve. This helps keep the vehicle stable and prevents jack-knifing.