405.4 Floor or Ground Surfaces.
Floor or ground surfaces of ramp runs shall comply with 302. Changes in level other than the running slope and cross slope are not permitted on ramp runs
405.5 Clear Width.
The clear width of a ramp run and, where handrails are provided, the clear width between handrails shall be 915 mm (36″) minimum.
405.10 Wet Conditions.
Landings subject to wet conditions shall be designed to prevent the accumulation of water.