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Case in point: A downhill serpentine in the Oregon Coast Range.
There is a line of minimum effort through each/every corner, it starts wide then dips down to the apex and runs wide again on exit.
If the corners are spaced regularly and alternately, the line for each succesive corner meets in the middle. So the car rolls to one side through the corner, then a flick of the steering wheel and it rolls to the other side and holds that through the next corner. Rinse and repeat.
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