Section R. 247.233 - Design featuresRule 33. The design features described in this rule and illustrated in figure 1 shall be used by the applicant in dimensioning a proposed driveway or driveway system on plans accompanying the driveway permit application. The dimensions to be used for various driveway design features, shown as a standard with a working range of dimensions, are given in tables 1 to 7, R 247.237 to R 247.249. These standard dimensions shall be used unless conditions warrant a deviation. The department may specify particular dimensions so a particular driveway system will accommodate vehicle movements normally expected without creating undue congestion or hazard on the highway or to provide reasonable access. The letters in the following design features refer to features in figure 1:
(a) Intersecting angle, A, the clockwise angle from a highway centerline to a driveway reference line which is the centerline or the edge of the driveway.(b) Driveway width, B, the distance between driveway edges of pavement or edges of the gravel surface measured at the point where the edges of the driveway become parallel, point b in figure 1. If the right-of-way line is so close to the pavement that point b falls on the applicant's property, then the width of the driveway at the right-of-way line shall be based on the projected driveway width.(c) Entering radius, C, the radius of a driveway edge curve on the right side of a vehicle entering the applicant's property.(d) Exiting radius, D, the radius of a driveway edge curve on the right side of a vehicle leaving the applicant's property.(e) Curb ending, E, the length of the height transition of the driveway curb from ground level to full curb height along an uncurbed highway. This curb transition may be 10 feet minimum.(f) Right-turn lane length, F, the length of an auxiliary lane constructed preceding the driveway to accommodate right-turn traffic entering the applicant's property.(g) Right-turn lane width, G, the width edge-to-edge of a right-turn lane, or the width edge-to-edge at the full width of entering and exiting tapers.(h) Entering taper, H, the length of a pavement widening, preceding the driveway for a right-turn lane or taper.(i) Exiting taper, J, the length of a pavement narrowing, following the driveway.(j) Entrance drive width, K, the width of the portion of a divided or a directional driveway that is used by a vehicle entering the applicant's property.(k) Exit drive width, L, the width of the portion of a divided or a directional driveway that is used by a vehicle leaving the applicant's property.(l) Island width, M, the edge-to-edge distance between an entrance drive and an exit drive.(m) Island length, N, the distance between ends of the island, measured parallel to the entrance drive.(n) Nose offset, P, the distance between the edge of pavement and the traffic island of a divided or directional driveway.(o) Curb cut, R, the length of the opening along a highway curb for a straight-sided residential driveway.(p) Distance between driveways, S, the inside distance between 2 adjacent driveways measured along a highway right-of-way line. Figure for 247.233
FIGURE 1
DESIGN FEATURES
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Mich. Admin. Code R. 247.233