The Secretary may require the user or users of a road under the control of the Forest Service, including purchasers of Government timber and other products, to maintain such roads in a satisfactory condition commensurate with the particular use requirements of each. Such maintenance to be borne by each user shall be proportionate to total use. The Secretary may also require the user or users of such a road to reconstruct the same when such reconstruction is determined to be necessary to accommodate such use. If such maintenance or