Section R. 247.263 - ProfileRule 63. A driveway profile shall be determined using the following criteria:
(a) If the highway is uncurbed, the grade of the driveway between the highway edge of pavement and the edge of the shoulder shall conform to the slope of the shoulder.(b) If the highway is uncurbed or if the sidewalk is more than 10 feet from the edge of the pavement or if there is no sidewalk:(i) The grade of a 2-way, 1-way or divided commercial driveway shall not exceed 1.5% for a minimum distance of 25 feet from the edge of the pavement. Beyond this distance, the grade shall not exceed 8%.(ii) The grade of a residential or utility structure driveway or field entrance shall not exceed 10%.(c) If the highway is curbed and if the sidewalk is 10 feet or less from the edge of the pavement, the grade of a driveway, except a directional driveway, shall be the grade required to meet the sidewalk elevation; but if that grade would exceed the maximums specified in subdivision (b), the sidewalk shall be either tilted or inclined.(d) The grade of a directional driveway shall be designed so to provide vision of the highway edge of pavement and the driveway surface for a distance of 100 feet along the driveway. For a driveway on an upgrade towards the highway, a grade of 1.5% for a distance of 100 feet from the edge of the pavement is acceptable. Beyond this distance, the grade shall not exceed 4% and the difference in grades where there is a change of grade shall not exceed 3%.(e) Vertical curves, with a minimum length of 15 feet, shall be provided at a change of grade of 4% or more.(f) If the sidewalk elevation has to be adjusted to meet the driveway, the department may require that the sidewalk be inclined at a rate not to exceed 1 foot vertical for every 24 feet horizontal.Mich. Admin. Code R. 247.263