The cross slope of ramp surfaces shall be no greater than 1:50. Ramp surfaces shall comply with 4.5.
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  4.8.6 Cross Slope and Surfaces
  
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  4.8.6 CROSS SLOPE AND SURFACES
  
The cross slope of ramp surfaces shall be no greater than 1:50. Ramp surfaces shall comply with 4.5.
 - Access Board: Doors in a Series
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  8.4 Recommendations
  
The peak clipping levels down from the peak cannot be greater than 18 dB....
 - Figure 1003.3.2 (Exception 1) Clear Pier Space Reduction at Boarding Piers – Drawing from the U.S. Access Board
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  11B-502.4 Floor or ground surfaces
  
Access aisles shall be at the same level as the parking spaces they serve. Changes in level, slopes exceeding 1:48, and detectable warnings shall not be permitted....
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  11B-813.2.1.2 Clearance
  
Changes in level are not permitted....
 - Access Board: Vertical Clearance for Protruding Objects
 - Access Board: Clear Floor or Ground Space
 - Access Board: Accessible Parking Pay Stations
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  PEMKO 1-3/8" Floor Plates/Safety Treads Product No.195
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  PEMKO 4" Carpet Separator Threshold No. 2364
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  PEMKO 6" Carpet Separator Threshold No. 2366
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  A. Purpose and Legal Authority
  
The Access Board is an independent federal agency established by Section 502 of the Rehabilitation Act (29 U.S.C. 792)....
 - Access Board: Door Opening Force
 - Access Board: Obstructed Side Reach
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  305.2 Floor or Ground Surfaces
  
Changes in level are not permitted. EXCEPTION: Slopes not steeper than 1:48 shall be permitted....
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  305.2 Floor or Ground Surfaces
  
Changes in level are not permitted. EXCEPTION: Slopes not steeper than 1:48 shall be permitted....
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  3. Exception to Ramp Running Slope
  
The MDE NPRM proposed that where there is a change in level at the entry of a wheelchair space that is greater than 1½ inches, the entry shall be ramped and have a running slope not steeper...
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  Landings [§405.7]
  
Landings [§405.7] Level landings are required at the top and bottom of each run. Changes in level greater than 1:48 are not permitted at landings....
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  Section 508
  
Architectural and Transportation Barriers Compliance Board 1331 F Street, N.W., Suite 1000 Washington, DC 20004-1111 www.access-board.gov 800-872-2253 (voice) 800-993-2822 (TTY)...
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  11B-305.2 Floor or ground surfaces
  
Changes in level are not permitted. Exception: Slopes not steeper than 1:48 shall be permitted...
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  11B-305.2 Floor or ground surfaces
  
Changes in level are not permitted. Exception: Slopes not steeper than 1:48 shall be permitted....
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  305.2 Floor or Ground Surfaces
  
Changes in level are not permitted. [ECTCR UFAS 4.2.4.3] EXCEPTION: Slopes not steeper than 1:48 shall be permitted....