The Load That Shifted on the Downgrade
You are driving a 26,000 lb GVW straight truck with a loaded flatbed trailer behind it, grossing 24,500 lb, on a 6 percent downgrade posted at 45 mph. The load is steel pipe bundled with two nylon straps, and you inspected them 90 minutes ago. Coming around a right-hand curve you feel the truck lean more than the curve should cause, and in the mirror the pipe bundle has slid about a foot toward the driver's side. You are 1.5 miles from the bottom where the grade flattens and a truck stop sits on the right. Traffic behind you is light. Your service brakes are warm but not fading.
1. What should you do in the next several seconds, and why?
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Slow down gradually and get off the grade - do not brake hard and do not continue to the truck stop as if nothing happened.
The lean you felt is the load's center of gravity moving outboard; a shift of a foot on a bundle that heavy changes weight distribution and can unload the opposite-side tires or the trailer's rear axle. On a 6 percent downgrade, hard braking transfers even more weight forward and can finish the slide or roll the bundle off. So:
- Ease off the throttle, use light steady braking to bleed speed, and let the grade do part of the work.
- Put on your hazards and find the first safe pull-off - a wide shoulder or the truck stop if it is close and reachable at low speed - rather than trying to make it to a destination.
- Once stopped, do not crawl under or beside the load to 'push it back.' Re-secure only from a safe position, and if the bundle cannot be made stable, call for help.
2. The straps still look tight. Does that mean the load is secure enough to continue?
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No. Strap tension is not the same as load security.
A bundle that has shifted has already demonstrated that the restraint system did not hold it against the forces of the curve and grade. Nylon straps also stretch and relax, and they can loosen as the load settles. What matters is:
- Whether the securement still contacts and holds the load in all directions, not just downward.
- Whether the aggregate working load limit of the tiedowns meets the requirement for the weight being carried.
- Whether the load's position on the deck is still stable and within legal limits.
If any of those is in doubt, the load is not secure, and continuing down a grade with a shifting load is the exact situation that produces rollovers and lost loads.