The "tri-axle fee" refers to an extra charge incurred when utilizing a truck or trailer outfitted with three axles.
Carriers or shipping entities usually impose this fee to account for the heightened weight or dimensions of the vehicle, which might necessitate special permits or result in elevated tolls on specific routes.
Tri-axle trucks are commonly deployed for transporting hefty or oversized loads, and this fee assists in covering the added expenses and logistical complexities linked to operating such vehicles.