Cargo Securement and Load Limits
This domain tests cargo inspection, tiedown requirements, weight distribution, and legal load limits. The exam expects specific numbers for tiedowns and axle weights.
Securement rules
Inspect cargo and securement before departure and recheck after travel begins. Use at least two tiedowns, and one tiedown for every 10 feet of cargo length. The aggregate working load limit of all tiedowns must be at least 50 percent of the cargo weight. Use a header board or equivalent to protect the cab from forward movement. Cargo must not obscure lights, reflectors, or plates.
Weight limits
Federal limits include 80,000 pounds gross vehicle weight, 20,000 pounds on a single axle, and 34,000 pounds on a tandem axle. The bridge formula may reduce allowable weight on shorter wheelbases. Distribute the load so no axle is overloaded, and know that Indiana enforcement uses scale and permit rules.
Worked example
You haul 18,000 pounds of cargo on a 25-foot deck. The aggregate working load limit must be at least 9,000 pounds. Four tiedowns rated at 2,500 pounds each give 10,000 pounds-acceptable. Three tiedowns give only 7,500 pounds-not acceptable. The 25-foot length also requires at least three tiedowns by the 10-foot rule, but the WLL requirement controls here.
Traps that cost marks
Counting tiedowns without adding their working load limits; using a tiedown rated below the load; forgetting the 50 percent aggregate rule; and failing to recheck cargo after miles of travel. Also do not confuse gross weight with axle weight.