Door maneuvering clearances are determined based on Approach Direction -- from the front, hinge side, latch side, approach side, pull or push side -- whether the path is perpendicular or parallel to a doorway.

See Table 11B-404.2.4.1 for each case scenario.

¼ inch is the maximum. 

34 inches is the maximum height.

36 inches is the maximum height.

The slope requirements for different parts of an accessible route vary.

Walkways 5%
Ramps 8.33%
Landings 2%
Elevator car 2%
Accessible parking 2%

8.33% is the maximum for a ramp slope. 

15” minimum
48” maximum

36” minimum, if serving elements are on only one side; otherwise 44” minimum.

The clear width of walking surfaces must be 36 inches minimum

30” x 48” is the minimum width.