I finally stopped to look more closely. These ripples are about 10 inches wide ands look to be almost exactly uniform through long stretches of road. Where does this precision come from?
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I spent a lot of time driving on dirt Roads in outback Australia, one of the old farmers told me that the corrugations, as he called them were formed by the average resonant frequency of the suspension and the average speed of the traffic on the road.
To Explain
If you walk up to most cars and press down firmly over the front wheels, the car will go down with your weight and come back up and then there will be a small bounce. This bounce changes the weight of the vehicle on the road, and as more vehicles travel along the road, you end up with the wave pattern in the dirt.
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