Rule 38.4.407 - OVERHEAD CLEARANCE - ALL OTHER STRUCTURES(1) Minimum overhead clearance as prescribed in ARM 38.4.404 may be decreased to the extent defined by the half-circumference of a circle having a radius of eight (8) feet six (6) inches and tangent to a horizontal line twenty-two (22) feet six (6) inches above top of rail at a point directly over the centerline of track.NEW, 1978 MAR p. 1485, Eff. 10/27/78.Sec. 69-14-116, MCA; IMP, Sec. 69-14-116, MCA;