Admin Order 58-16-01 - Laserfiche WebLink

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topographical or utility challenges. A design exception may also be authorized in a retrofit situation where an engineering study indicates a crossing is not warranted. Perpendicular and parallel ramps are allowed as defined by the Proposed Accessibility Guidelines. Perpendicular ramps are preferred and shall be used where conditions allow. Parallel ramps may be used in the presence of curb tight sidewalk or in locations where a perpendicular ramp is impractical due to topographical, right-of-way or utility challenges. All new access ramps shall provide a minimum continuous clear width of 5 feet. A clear width of 4 feet may be used in retrofit situations where existing infrastructure, topography, or natural features warrant a reduced clear width. All new landings shall provide a minimum 5 -foot by 5 -foot unobstructed area for turning space. A 4 -foot by 4 - foot landing may be used in retrofit situations where existing infrastructure, topography, or natural features warrant a reduced area. Landings at corners or areas with pedestrian signal push buttons shall be located to provide access to the push buttons per the 2011 Proposed Guidelines for Pedestrian Facilities in the Public Right -of -Way as published by the United States Access Board (located on the internet at www.access-board.gov). The design of ramps shall utilize winged (flared) returns to the maximum extent practical. The use of curbed returns shall be used in areas of right-of-way limitations or circumstances where vertical curbing is appropriate due to grading or infrastructure conflicts. In no case shall stand-alone linear curb be utilized. Underexposing wings is acceptable in retrofit situations in order to maintain maximum wing slope. Grade breaks shall be perpendicular to the path of travel. The remaining triangle shaped area between the truncated domes and the gutter line shall be graded to a maximum 5% counter slope provided it is not part of the'turning space or landing. Access ramps shall be designed for directional orientation of the user. The centerline of each ramp shall be oriented to line up and coincide with the centerline of the ramp on the opposite side of the street as closely as practicable. The Design Engineer shall prepare design detail drawings for each corner with ramps, each mid -block crossing, and every other ramp location shall be included in the plans at no greater than a 1 inch = 5 feet scale. Each drawing shall include complete design information such that the improvements may be constructed without further design calculation by the Surveyor, Inspector or Contractor. Access ramp drawings shall include dimensions for all features of the new improvements, including but not limited to: Public Improvement Design Standards Manual, 2016 Page 2-7