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The detectable warning shall be installed on the landing surface and shall extend from the top riser back for a distance of 36 inches (914 mm) minimum. The surface shall consist of grooves in the floor surface in a parallel or diamond mesh pattern or an applied mat or applied strips. Applied strips shall only be used indoors. The raised portion of the detectable warning shall be 1/8 inch (3 mm) high, 3/4 inches (19 mm) to 2 inches (51 mm) wide and the length shall extend for the full width of the stairway. The grooved portion shall be 1/4 inch (6 mm) to 3/4 inch (19 mm) wide. The grooved portion shall be 1/8 inch (3 mm) lower than the top of the raised surface, except that for an applied mat the grooved portion shall be 1/16 inch (1.5 mm) lower than the top of the raised surface.