Which of the following defines a heavy truck?

A heavy truck is defined as one that has a registered gross weight in excess of 17,000 pounds. This classification is important for regulatory purposes, particularly concerning inspections, licensing, and road use. Trucks that fit this definition can include various types of vehicles used for commercial purposes, such as delivery trucks and transport vehicles.

Understanding this definition helps in recognizing the different categories of trucks in relation to safety inspections, road regulations, and compliance with state laws. This classification often affects the maintenance requirements, the type of licensing needed for drivers, and the payment of specific fees or road taxes.

The other options do not align with the widely accepted definition of a heavy truck, as they either define weights that are too low for this classification or refer to load capacities instead of the truck's registered weight.