Rails at least 18 inches in height shall be provided along the back of grandstands, bleachers, stadiums and other like structures if the rear seat is more than 4 feet above the ground; along the portions of the ends of the structures where the seat are more than 4 feet above the ground and along the front of the structures if the foot rest is more than 2 feet above the ground.
09- 137 C.M.R. ch. 11, § 09