34 Pa. Code § 45.118 – Machine layout and clearances in sawmills.

(a) Either clear thoroughfare shall be provided on the side of the mill from the headsaws to the tramway, or an overhead runway equipped with standard handrails and toeboards. A horizontal clearance of at least three feet shall be allowed between any fixed object not required in the mill and any part of the traveling mechanism.
(b) If persons are required to cross the live rolls, a bridge shall be provided over the rolls. The bridge shall be equipped with standard handrails and toeboards.