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Start here
What you will be able to do
- Explain how cargo movement changes vehicle control.
- Distinguish containment from securement.
- Build a load-inspection decision routine.
- Recognize when commodity-specific or employer expertise is required.
Working vocabulary
Key terms before you begin
- Working load limit
- The rated load capacity assigned to a securement device or system component under the applicable rules.
- Blocking and bracing
- Structures or materials used to prevent cargo movement within or on the vehicle.
- Dunnage
- Material used to support, protect, separate, or help immobilize cargo.
- Aggregate working load limit
- The combined securement capacity calculated under the applicable rule for the tiedowns used.
01
Cargo changes the vehicle
Cargo location and movement affect axle loading, steering response, traction, braking distance, clearance, and rollover risk. A load can be inside a closed body and still move enough to damage the vehicle or change control.
- Too much forward weight can overload steering or axle components
- Too little steering-axle weight can reduce control
- High or off-center weight raises rollover risk
- Unrestrained movement can push during braking or shift during a curve
02
Match the method to the cargo
General securement rules require cargo to be immobilized or secured by structures, dunnage, shoring, tiedowns, or a suitable combination. Some commodities have additional specific rules. The correct method depends on cargo shape, weight, contact, vehicle structure, anchor points, and the ratings of every component.
03
Inspect the complete system
Inspect cargo, the vehicle structure, anchor points, devices, tension, edge protection, doors, covers, and clearance. Look for cut webbing, bent or cracked hardware, missing labels, loose chains, damaged binders, shifting, settling, or contact that can weaken the system.
- Correct load placement and distribution
- Securement devices suitable, undamaged, and properly tensioned
- Anchor points and vehicle structure sound
- Doors, tailgates, stakes, covers, and accessories secured
- Nothing can leak, blow, fall, roll, or shift dangerously
04
Recheck when the load or trip changes
Cargo can settle, compress, melt, shift, or loosen as the vehicle moves. Reinspection timing and exceptions depend on the applicable regulation and operation. At minimum, treat braking events, rough roads, stops, loading changes, and any unusual vehicle feel as reasons to assess the load immediately and safely.
05
Stop when control evidence changes
A new lean, pull, sway, noise, impact, height change, door movement, or strap vibration can signal a shifted or failing load. Leave traffic safely, secure the vehicle, inspect without entering a danger zone, and obtain qualified help. Do not open a door that may be holding back shifted cargo.
- Protect yourself from falling or pressurized cargo
- Control traffic exposure
- Do not stand in a likely release path
- Document and correct before movement
Put the lesson to work
The trailer suddenly feels different
After a hard brake for stopped traffic, the trailer begins leaning slightly and steering response feels different. The next scheduled stop is an hour away.
Safe decision sequence
- 1Treat the change as possible cargo movement.
- 2Reduce risk and stop at the first safe, lawful location.
- 3Inspect from a safe position without opening a door into a release path.
- 4Correct and document the securement before continuing.
Why this works
A reinspection schedule is not permission to ignore new evidence. Vehicle feel and visible change can require an immediate safe stop.
Retrieve before you review
Check your understanding
Answer each question aloud or in writing, then open the explanation.
1.Can cargo inside a closed trailer still require securement?Show answer
2.Why are device labels and ratings important?Show answer
3.What should a driver do after a hard event changes vehicle feel?Show answer
Lesson recap
Carry these decisions forward
- Load placement affects the whole vehicle.
- Match securement to the cargo and rated system.
- Inspect relationships and damage—not just device count.
- Recheck immediately when evidence changes.
Continue deliberately
Choose your next step
Review the explanation you still need, return to the library, or move to the next lesson when you can explain the safe decision in your own words.
Official references used to review this lesson
Reviewed August 26, 2026. The instruction is provided above; these links document the current sources checked and help you verify state- or operation-specific requirements.
Educational preparation only. This lesson does not replace your current state handbook, vehicle-specific instruction, employer procedures, federal or state regulations, supervised practice, or required ELDT. It does not guarantee a test result, license, job, or certification.