Which is true about CMVs and their following distances?

Answer: C — All of the above

The correct choice is that all of the statements regarding commercial motor vehicles (CMVs) and their following distances are true. For instance, when driving on ice, it is essential to double the following distance compared to normal conditions. This increased distance helps provide the driver with more time to react to slippery conditions and reduces the risk of collisions due to decreased traction. In wet pavement conditions, adding an additional two seconds to your following distance is necessary because rain can similarly reduce traction and increase stopping distances. This adjustment further enhances safety by providing a larger buffer zone for stopping. Increasing following distances in fog is also important, though it's emphasized in the context of adverse visibility. Fog can significantly obscure vision, and a greater following distance allows drivers more time to react not only to the vehicle in front of them but also to any unexpected changes in the driving environment. Recognizing and implementing these adjustments in following distance based on different road conditions is crucial in maintaining safety while operating CMVs. Thus, all the options highlight critical safety practices for driving under various conditions.