What does "load" refer to in commercial driving?

The term "load" in commercial driving specifically pertains to the weight being carried by the vehicle, which includes cargo, fuel, and any other equipment that adds to the vehicle's overall weight. The correct choice relates to the maximum safe weight that a tire can carry at a specified pressure. This is crucial because tires are designed to support a certain amount of weight safely; exceeding this weight can lead to tire failure, reduced control of the vehicle, and increased stopping distances.

Understanding the load that each tire can safely carry helps drivers ensure they are within the limits set by the tire manufacturer, thereby promoting safety on the road. Proper tire management is essential in commercial driving to maintain vehicle stability and efficiency.

The other options do not accurately define "load" in the context of commercial driving. The total weight of the vehicle encompasses more than just the cargo; it also includes the vehicle itself. The weight of the driver and passengers is a smaller component of the overall vehicle weight but does not define the term "load". Lastly, the volume of cargo refers to capacity rather than weight, which is again a different aspect from what is meant by "load."