Freight classification is a method to simplify the locations being serviced by a carrier.
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The significant difference between a class rate and a commodity rate is the type of freight being shipped.
The rating reflects the cost of shipment from one location to another .
As a general rule the greater the density the lower the freight rate.
If you want to find freight rates charged by a transportation company to deliver different size shipments between two cities you should check the bill of lading.