What factor does NOT affect the maximum allowable gross weight of a motor vehicle?

The maximum allowable gross weight of a motor vehicle is influenced by several factors, each contributing to the vehicle's design and operational capacity. While cargo weight is indeed a component of the total weight the vehicle carries, it does not directly determine the maximum allowable gross weight. Instead, this maximum weight is established by regulatory agencies based on the vehicle’s specifications and engineering parameters.

Factors such as vehicle design play a crucial role because the manufacturer designs the vehicle to handle specific loads based on its structural integrity and safety features. The number of axles also affects weight distribution and stability, influencing the weight capacity of the vehicle. Additionally, tire specifications are critical because they determine the load that each tire can safely support, which is a direct consideration in calculating maximum allowable weights.

In summary, while cargo weight contributes to the total weight being carried, it does not define the maximum allowable gross weight, which is primarily determined by the vehicle's design, axles, and tire specifications.