Cargo, Weight, and Securement
What this domain tests
This domain checks cargo securement rules and weight distribution. Expect questions on tie-down counts, working load limits, axle weights, and re-checking cargo.
Core rules
- Articles 5 feet or shorter and 1,100 pounds or lighter need at least one tie-down; longer or heavier articles need at least two. The aggregate working load limit must be at least 50 percent of the cargo weight.
- Secure dunnage and loose items. Re-examine cargo within the first 50 miles and every 150 miles or 3 hours afterward.
- Know gross vehicle weight, axle weight, tire ratings, and bridge formula limits. A legal gross weight does not excuse an overloaded axle.
Worked example
A 5,000-pound load needs an aggregate working load limit of at least 2,500 pounds. Four tiedowns rated at 700 pounds each provide 2,800 pounds, which is enough; two tiedowns at 700 pounds provide only 1,400 pounds and are not enough.
Traps
Counting tiedowns without checking their ratings, ignoring axle limits, and failing to re-check cargo after the first 50 miles are common errors. A load can be under gross weight and still be illegally concentrated.