1. (a) All steps, including floor line platform area, shall be covered with three-sixteenths inch (3/16”) ribbed or studded elastomeric floor covering that exhibits:

   1. (1) Good resistance to abrasion; and
   2. (2) High coefficient of friction.
2. (b) Step covering shall be permanently bonded to a durable backing material that is resistant to corrosion.

3. (c)

   1. (1) The steps, including the floor line platform area shall have a one and one-half-inch (1 1/2”) nosing that contrasts in color by at least seventy percent (70%) measured in accordance with the contrasting color specification in 36 C.F.R., pt. 1192, Americans with Disabilities Act Accessibility Guidelines for Transportation Vehicles.
   2. (2) The nosing shall be an integral piece without any joint extending to the leading edge of the nosing turndown.

4. (d)

   1. (1) Step tread covering shall have the following characteristics:

      1. (A) Special compounding for:

5. (i) Good abrasion resistance; and

   1. (ii) High coefficient of friction;

      1. (B) Tread material weight loss shall not exceed forty percent (40%), as tested under ASTM D-4060, Standard Test Method for Abrasion Resistance of Organic Coatings by the Taber Abraser, (CS-17 Wheel, one thousand-gram, one-thousand-cycle);
      2. (C) Step treads shall not break, crack, or check after ozone exposure (seven (7) days at fifty miles per hour (50 mph) at forty degrees Celsius (40˚ C) and weatherometer exposure (ASTM D-750, Standard Test Method for Rubber Deterioration in Carbon-Arc Weathering Apparatus, seven (7) days); and
      3. (D) Step treads shall have a calculated burn rate of one-hundredth (.01) or less using the test methods, procedures, and formulas listed in FMVSS 302, Flammability of Interior Materials.

   2. (2) Note.

      1. (A) A spray-on application type material may be used in lieu of subsection (a) of this section, that meets the requirements of subsections (b) and (c) of this section and this subsection.
      2. (B) The material shall be applied not only to the interior surfaces of the service doorstep treads but also to the exterior, if not covered by undercoating.

Codification Notes: “FMVSS” means Federal Motor Vehicle Safety Standards.