Corrugations in road—those washboard ripples on gravel—form when tyres repeatedly hammer loose surfaces, throttle/brake inputs and suspension feedback set up vibrations, and speed plus dryness lets the ridges grow.
They’re rough on cars and nerves, so slow to a steady, safe pace, avoid hard braking on the ripples, and pick the firmest line rather than diving into the soft stuff.
A small tyre-pressure reduction—about 10–15% from your normal highway pressures—can improve grip and comfort; re‑inflate once back on sealed roads and watch heat build‑up.
In a 4WD, high‑range four‑wheel drive and smooth throttle let the suspension work, and extra following distance keeps flying stones and panic stops at bay.
After a long corrugated stretch, check for loose wheel nuts, hot shocks and tired bushings—corrugations are brutally honest about worn components.
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