Washboarded

In the case of trucks, a badly “washboarded” highway tends to limit the maximum possible load which the truck's springs can carry.

To estimate this sap tension, a cylindrical item, having the same radius as that of the depressions on the wavy, washboarded surface, was pressed from the top into the earlywood layer of a specimen placed on the flat dynamometer, until the depth of depression produced equalled that for the washboarded surface.

So, into his car we climbed, driving about five and a half miles east of town on bumpy, dusty, hilly, washboarded gravel roads, churning up a trail of dust as we went.

Chances are good that it is extremely washboarded by now.