Operation of mobile equipment
105No employee shall put any mobile equipment in motion unless the employee is satisfied it is in safe operating condition and the employee
(a)
has an unrestricted view of the area over which the mobile equipment is to be moved,
(b)
receives signals from some other person who has an unrestricted view of the area over which the mobile equipment is to be moved, or
(c)
has just previously inspected on foot the immediate area over which the mobile equipment is to be moved.