Transporting Cargo Safely
What this domain tests
Cargo questions test whether you can inspect a load, secure it against movement, distribute weight legally, and recognize when cargo blocks lights, plates, or the driver’s view. Expect practical scenarios about tiedowns, axle limits, and load shifts.
Core rules
- Inspect cargo before, during, and after the trip. Recheck after the first few miles and after any hard stop.
- Cargo must be contained, immobilized, and secured so it cannot leak, spill, blow off, or shift.
- The aggregate working load limit of all tiedowns must be at least 50 percent of the cargo weight for ordinary articles.
- Do not obscure required lights, reflectors, plates, or the driver’s view.
- Know axle and gross weight limits: 20,000 pounds on a single axle and 34,000 pounds on a tandem axle are common federal limits, with bridge-formula limits also applying.
- A bulkhead or headboard helps contain forward movement, but it must be strong enough for the load.
Worked example
A flatbed carries 30,000 pounds of secured machinery. The tiedown aggregate working load limit must be at least 15,000 pounds (50 percent). If each strap has a working load limit of 5,000 pounds, at least three straps are needed. Four straps would provide 20,000 pounds of aggregate capacity and a margin. The number of straps alone means nothing unless their rated capacity is added correctly.
Traps that cost marks
Counting tiedowns instead of adding their working load limits; using working load limit and breaking strength interchangeably; forgetting that loose aggregate can shift; overloading one axle while staying under gross vehicle weight; and failing to recheck cargo after starting the trip.