I have a theory that if everyone with 4wd would use the 4wd mode, it would help prevent the washboard effect. I think it is minor slippage and a slight bounce by hundreds of 2wd cars going over the road that creates the washboard.
Could be true. I suspect the machines that are used for grading the road also contribute ot it littlebit
The machines :
And the beautiful white mountain peak :
Trail with some bikers
Snow patches near the summit
