Section R. 280.3 - Computation of supplemental benefitsRule 3.
(1) Supplemental benefits for county roads and state highways, which shall result from maintenance, improvement, or the installation of facilities, structures, or mechanical devices jointly determined to be necessary by the highway jurisdiction and drain commissioner or drainage board to accommodate or relieve county road drainage or state highway drainage, shall be computed in the direct proportion of the estimated cost or the actual cost, if known, of such maintenance, improvement, facilities, structures, or mechanical devices to the estimated construction cost or the actual construction cost, if known, of the total project.(2) Supplemental benefits for county roads and state highways, which shall result by reason of special specifications or construction conditions required by county highway authorities and state highway authorities, shall be computed in the direct proportion of the estimated cost or the actual cost, if known, of such special specifications or construction conditions to the estimated construction cost or the actual construction cost, if known, of the total project.Mich. Admin. Code R. 280.3