Washboard road in the lab

Dry sand or gravel roads develop ripples under the action of rolling wheels. This makes for annoying driving conditions. This experiment demonstrates the effect by rolling a small wheel on a bed of sand at the edge of a rotating table. For more, see If you have pictures of movies of real washboard road, we are interesting in seeing them. Movie made at DAMTP, University of Cambridge. Nicolas Taberlet, Stephen Morris and Jim McElwaine.