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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As someone who grew up on a dirt road, these are formed by accelerating, the drive wheels of the car push against the road surface, blacktop doesn’t move, dirt does.
As cars repeatedly drive on the dirt road these get bigger and more of them.
You will notice they only happen and places where you are going to accelerate, like from a stop or coming out of a turn.
When there are enough of them, your tires ride on the tops skipping over the dips.
They are evenly spaced because car’s wheel bases are similar.
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