Which feature distinguishes a heavy load vehicle from a light load vehicle?
High payload capacity
Vehicles are graded as heavy or light duty by the useful weight of goods they are built and rated to carry, not by features common to every vehicle. The distinguishing feature must relate to that carrying ability.
The measure of how much cargo a vehicle can legally and structurally carry is its payload capacity.
A heavy load vehicle is given a stronger chassis, heavier axles and tougher suspension so that it can support a much greater payload than a light load vehicle.
High payload capacity is therefore the property that actually separates a heavy-duty vehicle from a light-duty one.
A steering wheel and headlights are fitted to virtually all road vehicles, and an aerodynamic shape is a styling or efficiency feature found across many types, so none of them marks out load class.
The defining difference is how much the vehicle is rated to haul.
Hence, the answer is High payload capacity.
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