The Load That Shifts on the Bend
You are carrying steel coils on a flat-top trailer secured with chains and dogs. You tensioned them at the depot. After 80 km including two roundabouts, you stop for a check. One chain has visibly slackened and the coil has rotated slightly on its cradle; the timber dunnage has compressed. The coil is still on the trailer. Nothing has fallen. You are 120 km from delivery and running early. A fellow driver says coils 'always settle' and to just retension and go.
1. What does the slackened chain and rotated coil tell you, and why is 'just retension' insufficient?
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The symptoms are a load shift in progress: the coil has rotated on its cradle and the dunnage has compressed under load. Both mean the securing system has lost tension and the load's position has changed. A slack chain is not a cosmetic issue - it is evidence the restraint is no longer holding the load as designed.
'Just retension' is insufficient because:
- Retensioning a shifted load locks in the new position - the coil is no longer seated where it was secured; retensioning may hold it in a rotated, less stable attitude.
- Compressed dunnage means the bearing surface has changed; the original friction assumption no longer holds.
- A load that has moved once can move again - the underlying cause (insufficient restraint, poor dunnage, inadequate friction) has not been fixed.
Steel coils are a high-consequence load: a rotating coil can roll off in a bend. 'Coils always settle' is exactly the complacency that precedes a load-loss incident.
2. Set out the check and corrective steps before you continue.
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- Park safely on level ground, off the traffic lane, hazard lights on, park brake applied.
- Inspect the whole load, not just the slack chain: check every chain/dog, the dunnage, the cradle/chocks, and whether the coil has moved relative to its original marks. Photograph the condition.
- Re-seat the load - the coil must be returned to its correct, stable position on sound dunnage; replace compressed or broken dunnage rather than tensioning over it.
- Re-secure to the correct standard for the load, using the right number and arrangement of restraints and, where required, chocks/blocking to prevent rotation and forward movement.
- Re-check after a short distance (e.g. 10–20 km) and again at the next stop, since new dunnage will settle.
- Report the load shift to the operator if required by their procedure, and record the inspection.
Only continue when the load is correctly seated and secured and you are satisfied it will stay put through bends and braking.
3. How should the 'running early' and the other driver's comment influence your decision?
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Neither should. Running early is not a reason to skip the fix - being ahead of schedule gives you the time to do the job properly, which is the opposite of a reason to rush. The clock is not a factor in whether the load is secure.
The other driver's 'coils always settle' is anecdotal normalisation of a real hazard. Settling that compresses dunnage and slackens chains is a signal to inspect and correct, not to ignore. If other drivers routinely retension and continue without re-seating the load, that is a practice worth reporting, not copying.
Your decision rests on one question: is the load correctly seated and secured right now? Until the answer is yes, the vehicle does not move.