Access management(excerpt from policy guidebook)
112.4(7) Entrance widths (page 10)The width of an entrance is the distance between the beginning points of the return radii or flares, measured perpendicular to the centerline of the entrance.
- Type "A" entrances. Each case requires special study. See rule 112.5(306A).
- Type "B" entrances.
- The minimum allowable width is 24 feet.
- The maximum allowable width is 45 feet.
- For one-way operation, the minimum allowable width is 12 feet and the maximum allowable width is 30 feet.
- Type "C" entrances.
- The minimum allowable entrance width is 20 feet. In an area where the posted speed limit is 35 miles per hour or less, a minimum width of 15 feet may be allowed.
- The maximum allowable width is 30 feet.
- If an entrance will serve more than one property, the minimum allowable width is 20 feet and the maximum allowable width is 35 feet.
- City street and secondary road intersections. The department shall determine the width of city street and secondary road intersections on a case-by-case basis, taking into consideration both local and department standards.