49 CFR 213.361 - Right of way.
The track owner in Class 8 and 9 shall submit a barrier plan, termed a “right-of-way plan,” to the Federal Railroad Administration for approval. At a minimum, the plan will contain provisions in areas of demonstrated need for the prevention of -
(b) Launching of objects from overhead bridges or structures into the path of trains; and
(c) Intrusion of vehicles from adjacent rights of way.