Detailed Explanation

Freight class is determined by the National Motor Freight Traffic Association (NMFTA) and published in the National Motor Freight Classification (NMFC) guide. Classes range from 50 (lowest rate, easiest to ship) to 500 (highest rate, most difficult to ship). The four factors that determine freight class are: density (weight per cubic foot), stowability (how easily it fits with other freight), handling (special equipment or care needed), and liability (value and fragility). Accurate freight classification is critical for LTL shipping as it directly impacts the rate charged.