CDL · General Knowledge · 6 min read
Checking Cargo Before and En Route
- Identify driver inspection duties for cargo before departure and within the first 50 miles en route.
- Define legal weight limits, equipment ratings, and the protective purpose of bridge formulas.
- Explain how proper weight distribution, center of gravity, and securement systems protect vehicle handling and safety.
Cargo Inspection Duties and Driver Responsibilities
As the driver, you are responsible for not being overloaded and for checking that cargo is balanced and secured properly as part of the vehicle inspection. Inspecting cargo is a required part of the vehicle inspection, not an optional step you can skip when time is tight. Even if warehouse staff or a loading crew placed the freight into your vehicle, the driver is responsible for ensuring the vehicle is not overloaded. Before you begin your trip, you must complete a thorough pre-trip check to confirm three primary load conditions: you must ensure the truck is not overloaded, you must ensure the cargo is balanced properly across the vehicle, and you must ensure the cargo is secured properly against movement.
Your duty to check cargo does not end when you pull away from the loading facility. Road vibrations, turns, and changes in speed cause freight to settle and shift. Because of this movement, you must inspect the cargo and its securing devices again within the first 50 miles after beginning a trip. Within the first 50 miles after beginning a trip, inspect the cargo and its securing devices again and make any adjustments needed.
Knowing when and how to inspect cargo is essential for passing your commercial driver license exams and operating safely in the real world. Keep in mind that specific test lengths, passing scores, and certain state regulations can vary depending on where you test. No single state's administrative process applies everywhere, but the safety standard requiring an initial cargo check and an en route recheck within the first 50 miles is a foundational principle of professional driving.
Common mistakes
- Failing to conduct the required en route cargo check within the first 50 miles after beginning a trip and neglecting to make necessary adjustments to securing devices.
- Loading heavy freight on top of lighter items, which creates a high center of gravity and makes the vehicle more likely to tip over in curves or when swerving.
- Shifting weight too far to the rear can leave the front axle too lightly loaded for safe steering; separately, too little weight on the driving axles can cause poor traction.
- Assuming that driving at legal maximum weights is always safe, ignoring that operating at legal maximum weights may not be safe during bad weather or mountain driving.
Key points
- Inspecting cargo is a required part of the vehicle inspection; the driver must ensure the vehicle is not overloaded and that cargo is balanced and secured properly.
- Inspect cargo and securing devices again within the first 50 miles after beginning a trip, and make any adjustments needed.
- States set legal limits for GVWRs, GCWRs, and axle weights, and bridge formulas permit less maximum axle weight for axles that are closer together to protect roadways and bridges.
- Overloading causes bad effects on steering, braking, and speed control, leading to slow travel on upgrades, excess speed on downgrades, longer stopping distances, and possible brake failure.
- The height of the center of gravity is critical for handling; place the heaviest parts of the cargo beneath the lightest parts to keep the center of gravity as low as possible and reduce the chance of tipping in curves or swerves.
- Weight balance affects control: too much weight on the steering axle can cause hard steering and damage the axle and tires; too little weight on the front axle can make steering unsafe, and too little weight on the drive axles can reduce traction and cause the drive wheels to spin.
- Federal regulations require the aggregate working load limit of a securement system to be at least one-half the weight of the article or group of articles being secured.
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