Section 247.233. Design features.

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

History: 1979 AC.