Walkways with a running slope greater than one-in-20 (1:20) (5%) are ramps and shall comply with 521 CMR 24.00: RAMPS.
Exception: Sidewalks on streets and ways shall be considered walkways, with the exception that if the slope of the natural topography exceeds one-in-20 (1:20) (5%) a ramp is not required.
521 CMR, § 22.3