Resolution No 36-2021 - Adopting Revised Construction Standards and Specifications

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SECTION 2 – STREETS, WALKWAYS & PATHS 12 2-2.10 INTERSECTIONS Intersection geometry shall be designed to accommodate the design vehicle through all maneuvers. Standard Drawings include some typical intersection geometries and treatments, though other options may be used subject to the approval of the City Engineer. Streets should intersect at an angle as close to ninety (90) degrees as possible, but desirably not at an angle less than eighty (80) degrees. Sight distance should be verified at all intersections impacted by an improvement in accordance with Chapter 46 of the IDM, and obstructions removed in order to provide the required intersection sight distance. See Section 2-2.6 Sight Distance for other provisions. For new developments or modifications to existing sites, intersections should be spaced not closer than 300 feet between the centerlines, except along Major or Arterial streets, where intersections should be spaced not closer than 400 feet. The designer should also consider traffic movements of the roadway and adjacent developments. New intersections should align with other existing roadways as a best practice. The grading of reconstructed signalized intersections should be tabled for both the major and minor approaches in order to provide smooth travel paths in all directions. Tabling should be accomplished by transitioning the cross slope of each travel lane from the typical slope to the tabled slope without abrupt changes and not exceeding maximum transition longitudinal grades within AASHTO. For two-way stop-controlled intersections, cross slope priority should be given to the uncontrolled approaches. Drainage should be considered for areas where cross-slopes are modified. 2-2.11 APPROACHES Residential approaches are not allowed within fifty (50) feet of an intersection, measured from the intersection of the extended street gutter lines and the point where the nearest side the approach intersects the street gutter line. Residential property lot approaches are limited to one (1) per street and one (1) per alley. “U” driveways will be considered on a case by case basis. Commercial approaches are not allowed within 100 feet of an intersection, measured between the intersection of the extended street gutter lines and the point where the nearest side the approach intersects the street gutter line. Commercial lots are limited to one (1) approach per street when the access frontage is less than 150 feet. Commercial lots are limited to two (2) approaches per street when the access frontage is greater than or equal to 150 feet, with forty (40) feet minimum distance between the approaches. Alley access shall be for destination use and not for vehicle site circulation or cut through routes. Parking adjacent to alleyways shall have defined approaches. Commercial approaches should be aligned with opposite commercial approaches or intersections and turning movements should be analyzed due to the proposed change in traffic. Approaches shall not impact the cross slope of sidewalks or pathways so that it exceeds one and one-half percent (1.5%). Ideally, sidewalks shall not change longitudinal grade through a driveway or other approach. Where not possible, affected sidewalks shall be reconstructed to the next joi nt required by a grade not exceeding five percent (5%). The maximum slope of an approach is eight percent (8%), unless approved by the City Engineer, with grade transitions minimized and a maximum algebraic grade difference of ten percent (10%). The desirable radius is twenty (20) feet and the minimum is ten (10) feet in constrained locations or adjacent to on-street parking.