(A) In addition to the placement standards set forth in Table 1 (see § 94.48(C)), driveways should be located in a manner that affords adequate ingress and egress to the street as safely as possible. Adequate sight distance is a key consideration in determining the appropriate locations of driveways.
(1) The sight distance triangle of 20 feet (representing one typical vehicle) is defined as the lateral measurement along the centerline of the proposed driveway from a projection of the curbline or edge of pavement of the intersecting street; and the stopping sight distance recommended by American Association of State Highway and Transportation Officials (AASHTO) for the design speed of the intersecting street; and measured along the curbline intersecting the proposed driveway to a point adjacent to the center of the nearest approach lane carrying through traffic in each direction, as shown in Appendix B.
(2) An offset greater than 20 feet may be required when the placement of pedestrian crosswalks results in an additional setback of the marked or implied vehicle stopping point.
(B) AASHTO guidelines also apply to vertical stopping sight distances.
(1) When conditions merit, the owner may be required to submit roadway and driveway profiles demonstrating that adequate vertical sight distance also exists.
(2) In lieu of providing vertical sight distance profiles, a licensed professional engineer may be may place a note on the plans, stating that the proposed driveways have been designed and located to provide adequate horizontal and vertical sight distance in accordance with AASHTO standards.
(3) A figure included in Appendix B depicts an example of the vertical sight distance requirements.
(C) To provide and maintain an adequate “window of visibility” for the motorist, no object, planting, structure, or sign shall be placed within this triangle at a height between two and a half feet and ten feet above the finished grade of the proposed driveway.
(Ord. 2012-02, passed 2-27-12)