2018-06-25-minutes-public-works-study-session

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G. Corner Radii. At road intersections, the following typical minimum curb line radii for curb returns shall be as follows: 1. Local Access Road -Local Access Road Intersection 25 feet 2. Local Access Road — Collector Intersection 30 feet 3. Collector -Collector Intersection 35 feet 4. Arterial -Arterial or Arterial -Collector Intersections 55 feet. Corner radii greater than the above ranges shall be used if the anticipated composition of traffic warrants such a need. Curb radii shall be subject to approval by the County Engineer. H. The right-of-way or easement for roadways shall be rounded at intersections by an arc, the minimum radius of which shall be no less than 35 feet. Additionally, corner lots shall have no length dimension less than 90 feet. I. When a new or reconstructed road is designed to intersect with another public road, an intersection plan shall be submitted. The intersection plan must be clearly detailed to show flow line grades and how surface drainage will be controlled at the intersection. Curb return data shall be shown on the road construction plans. At the intersection of roads with different classifications, the centerline slope and typical cross section of the higher classified road should be carried through the intersection with the lower classified road matching in a manner which will not interfere with the smooth movement of traffic in the travel lanes of the higher classified road. K. Where two roads of the same classification intersect, the centerline grade shall be matched at the center of the intersection with cross slopes varying through the intersection to allow drainage. All classes of local access roads shall be treated as the same classification for purposes of this subsection. L. The design of access points must take into consideration the percentage of truck traffic utilizing the access point. Drainage patterns must also be taken into account in the design of access points. Larger access point radii (typically between forty and fifty feet but possibly as much as seventy feet) may be required for access points when multi -unit vehicles or single -unit vehicles exceeding thirty feet in length (SU vehicle equals thirty feet) comprise ten percent or greater of the traffic expected to use the access point. Vehicles should be able to utilize radius return access points without encroaching on adjacent lanes of traffic. M. Additional right-of-way in the form of a maintenance easement may be required to ensure the necessary sight distance (obstruction free zone) can be preserved. 12.04.04.080 Roundabouts Title 12 Kittitas County Code Draft No. 5 —Working Draft for Adoption 6/12/2018 43