CDL General Knowledge TestTransporting Cargo SafelyHard
A driver is preparing to transport a load of large, heavy pipes on a flatbed trailer. The pipes are stacked pyramid style. Which of the following securement methods is most appropriate to prevent forward and backward movement?
- ASecuring the pipes with chains that are tensioned diagonally to the frame, along with end blocking.
- BUsing only side-to-side tie-downs over the top of the pipes.
- CUtilizing friction mats underneath the pipes to increase grip.
- DPlacing chocks and cradles at the ends of the pipes to prevent rolling and shifting.
Show answer & explanationAnswer & explanation
Correct answer: A. Securing the pipes with chains that are tensioned diagonally to the frame, along with end blocking.
For heavy, cylindrical objects like pipes, especially when stacked, preventing longitudinal (forward/backward) movement is critical. End blocking, combined with tensioned chains that create diagonal forces, effectively restrains movement in both directions. Chocks and cradles primarily prevent rolling, and friction mats help, but don't provide primary longitudinal restraint for heavy, stacked items.
Why the other options are wrong
- B. Side-to-side tie-downs primarily prevent lateral movement, not forward/backward.
- C. Friction mats help, but they are not sufficient as the primary means to prevent longitudinal movement of heavy, stacked pipes.
- D. Chocks and cradles are good for preventing rolling, but less effective on their own for significant forward/backward movement of stacked pipes.
Securing Cylindrical Cargo
Methods to prevent rolling and longitudinal movement of items like pipes, coils, or drums.
- Requires blocking, chocks, or cradles.
- Tie-downs must provide vertical and/or diagonal restraint.
- End blocking is crucial for longitudinal securement.
Memory trick: Rollers need blocking, chains need tension, keep them from moving in any dimension.