ARM 38.4.409
ARM 38.4.409. SIDE CLEARANCES IN GENERAL
Cite as Mont. Admin. R. 38.4.409
(1) Side clearance in general is required to be at least eight (8) feet six (6) inches.
(2) To further reduce operational hazards, it is recommended that, wherever practicable, all posts, pipes, warning signs and other small obstructions be given a side clearance of ten (10) feet.