(1)
Except as provided in Sentence (2), tactile attention indicators conforming to Article 3.8.3.18., shall be installed
(a)
at the top of flights of stairs that are unenclosed, and
(b)
at drop-off edges with a change in elevation greater than 300 mm that are unprotected by a guard. (See Note A-3.3.1.19.(1))
(2)
Sentence (1) does not apply to service spaces, bleachers addressed in Subsection 3.3.2., stages, loading docks, industrial occupancies, within dwelling units, and to stairs and drop-off edges serving not more than two dwelling units.