Indeed. But can it be used to eliminate the washboard in my gravel roads?!
Simply blading over washboard and filling the depressions
between the ridges is nearly useless. The best method is to
cut all of the material loose to a depth of 1 inch or more below the bottom of the washboard area. This brings up some fines to mix with the surface material. Then transfer the material to the proper crown and shape.
But remember that one cause of washboarding is dry conditions. ‘Never work on washboarding problems without good moisture in the material. When possible work the problem areas after a good rain and then resume normal blading.