(225 ILCS 705/19.12)
(from Ch. 96 1/2, par. 1912)
If a designated escape way is a slope of not less than 20
degrees nor more than 45 degrees, it shall be equipped with a stairway or
adequate walkway with cleats. If the slope is more than 45 degrees,
stairways shall be installed.
(Source: Laws 1953, p. 701.)