ADA Design Overview Section 2 ADA Design Overview Overview Accessible Pedestrian Signals Alternate Fall, 2017 Ann Johnson, PE Services Brady Rutman, SRF Consulting Group 2 Pedestrian Access Route (PAR) = A continuous and unobstructed walkway within a pedestrian circulation route that is specifically designed for ADA-accessible pedestrian travel 3 Critical Components Pavement Surface Width Running Slope Cross Slope Accessible Parking Intersections Crosswalks Doors & Doorways Stairs & Ramps Landings 4 1
Pavement Surface Stable, Firm, Slip-Resistant Pavement Surface Stable, Firm, Slip-Resistant 5 6 Pavement Surface (Non-Compliant) Width Clear width must have a minimum of 4 (Ideally at least 5 ) 7 8 2
Width Clear width must include passing spaces if less than 5 32 absolute minimum adjacent to protrusion/obstruction Running Slope Maximum slope of 1:20 (5.0%) along primary direction of travel (OR match existing roadway slope) Slopes greater than 5.0% are ramps and must have landings (and often handrails) 9 10 Cross Slope Slope perpendicular to main direction of travel must not be steeper than 1:48 (~2.0%) Accessible Parking Lots Reserved Accessible Parking Stalls Access Aisle 2.0% Maximum Slope in ANY Direction Connected to PAR 11 12 3
Urban or High Pedestrian Traffic Areas 13 14 15 16 4
Doors & Doorways 17 18 Stair & Ramp Components Running Slope & Cross Slope Landings & Turning Space Geometry Width Tread/Riser Design Handrails Edge Protection Condition Vertical Discontinuities Cracking/Crumbling Surface Characteristics 19 Stairs & Ramps 20 5
Landings Minimum dimensions: 4 x4 Maximum slope: 2% in ANY direction Landings All grade breaks within the PAR shall be constructed perpendicular to the path of travel 21 22 Running (Ramp) Slope Cross-Slope Landings Approach Ramp Length and Width Detectable Warnings Ramp Flares Curb Tapers Grade Breaks Gutter Slope Counter Slope Physical Condition Running (Ramp) Slope Cross-Slope Maximum 8.3% (1:12) Maximum 2.0% (1:48) 23 24 6
Landings A Level Space for Maneuvering: Required at the top of ramps exceeding 5.0% and at any change of direction Minimum Dimensions: 4 X 4 (Preferred 5 X 5 or full walk width) Maximum 2% Slope in ANY DIRECTION Approach Pavement leading to the top of the ramp May be parallel or perpendicular to curb Ramp Length Must be long enough to achieve height of curb at less than 8.3% slope May not exceed 15 without an intermediate landing (30 rise) 25 Ramp Width Must be a minimum of 4 26 Detectable Warnings(Truncated Domes) Purpose: To inform pedestrian of the roadway edge Extend full width of ramp (within 3 on each end) Minimum of 24 continuous depth in direction of travel Place within 3-6 of back of curb or edge of roadway Color to contrast with concrete Ramp Flares and Curb Transitions Walkable Surfaces 1:10 (10%) Maximum Flare Slope 27 28 7
Ramp Flares and Curb Transitions Non-Walkable Surfaces 1:6 Concrete Flare OR 1:6 Graded Flare OR Returned Curb Grade Breaks Lines that separate the ramp itself from landings and flares Shall be perpendicular to the path of travel Contraction joints to be constructed along grade breaks 29 30 Gutter Slope Slope of gutter flow line across bottom of ramp Maximum 2.0% slope Counter Slope Cross slope of roadway or curb at bottom of ramp Maximum 5.0% slope Physical Condition Ramps can be non-compliant due to their poor physical condition: Poor Drainage, Cracking/Crumbling, Vertical Discontinuities, Etc. 31 32 8
Accessible Pedestrian Signals Temporary Accessible Pedestrian Signal (APS) = A signal that communicates information about the Walk phase in audible and vibrotactile formats Alternate Pedestrian Access Route (APAR) 33 34 Temporary Example 35 9