Ordinances-2003-260

of Transportaion. Variance form these values may be justified by the requirements of the design vehicle. The offset from the edge of prescribed roadway pavement and the island curb face should be 5 feet. b. Radius Return The radius returns used to connect the access to the prescribed roadway shall fall entirely within the right-of-way. It may be permitted to go outside the right-of-way if raised curbing extends into the private property. The radii will generally be between 30 and 50 feet, except for three-centered-curves, which may have larger radii. The entrance to the development should have adequate radius returns, driveway widths, and if applicable, deceleration and turning lanes to avoid backing up traffic on the prescribed roadway. Smooth and unrestricted entry for access traffic shall be the goal. c. Angular Placement The centerline of an access should either be at a right angle to the highway or parallel to the development's property line. The angle between the access and highway centerline may be reduced to a minimum of 60 degrees for one-way and two-way access. d. Access Location i. A minimum distance of 10 feet shall be maintained between a property line and any part of the access flare. Where volume projections indicate a need, sufficient distance from adjacent roadways or property lines should be allowed for the construction of right-or left-turn lanes, acceleration or deceleration lanes. ii. If multiple accesses are provided for facilities, sufficient distance must be allowed between entrances for the construction of turning lanes, or other additional lanes needed. This will also result in separating the points of conflict created by such entrances and will encourage internal circulation. A minimum distance of 440 feet between the centerlines of adjacent entrances will be required for these purposes, unless a more restrictive minimum distance is specified by the Iowa Department of Transportation Design Manual.