Which of the following best describes a combination vehicle?

A combination vehicle is defined as a motor vehicle that consists of a combination of two or more vehicles, such as a tractor and a trailer, or a truck and a trailer. The key to categorizing a combination vehicle is the weight of the vehicle being towed, which is generally significant.

In this context, the correct answer signifies that a combination vehicle is over 26,000 pounds when the weight of the towing vehicle is taken into account, regardless of the weight of the vehicle being towed. This classification is important for understanding licensing requirements and safety regulations. A vehicle with a weight over 26,000 pounds typically requires a CDL to operate, ensuring that the driver is trained and qualified to handle such a large and potentially complex vehicle.

The other choices do not accurately capture the legal definition of a combination vehicle. For instance, a vehicle towing another vehicle or a setup with a trailer weighing 10,000 pounds or less might not meet the specific requirements for what constitutes a combination vehicle within regulatory frameworks. Similarly, a motorcycle towing a sidecar does not fit the definition of a combination vehicle as it involves a fundamentally different vehicle type and typically does not require the same level of licensing or training.