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The key to minimising vibration to the vehicle is to travel over corrugations at harmonic speed. This is between 40-60 km/h, but the speed may vary depending on the height and length of the corrugations. Whilst feeling comfortable inside the vehicle, the tyres, axles & suspension are still being stressed.

If the corrugations have been formed by a road train or heavy vehicle they will more than likely be unpleasant for a 4 wheel drive vehicle. This is because the harmonic action of a road train’s suspension & tyres which form them in the first place, are different to that of a 4 wheel drive.
Just as the key to the formation of corrugations is the harmonic action of the vehicle, then the key to minimising the occupant stress is to find the best possible speed in which to travel over them, or harmonic speed. Lowering the tyre pressure a little can help, however, if too much pressure is released, the tyres can heat up or even come off the rims. Land Rover nominates the harmonic speed for their vehicles as between 40-60 km/h.
Corrugated dirt or gravel roads cause severe vibrations that can cause vehicle damage as nuts rattle off and vibrations damage electrical and other components.
It is a good idea to check all nuts and bolts to see they haven't vibrated loose after long trips on corragations. It is especially important to check all suspension components.
 
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