All safety and fencing shall extend the entire length of and not less than 25 feet beyond each side of all grandstands, bleachers, stadiums, other similar structures and any other designated spectator area. In addition, the safety barriers and fencing shall extend toward the rear of any such structures or designated spectator areas, at right angles to the race track a distance of at least 50 feet, as in Figure 1 or 2 as appropriate.
09- 137 C.M.R. ch. 11, § 13