I am in favor of painting the poles and their protectors a different color than the forklifts, so any strike shows up on the forklift, and instructions signed by all operators that every pre-operation inspection report all marks of that color paint, failing to report any mark will mean that operator is the responsible party for failing to keep their forklift under control.
I also like to take ALL the operators around and make them each touch each pole, then sign that they have been instructed as to the location of these hazards.
I am also a fan of explaining to the operators that the alternative equipment they will operate will be a push broom, not even a hand pallet jack.
you could also google: "shockwatch" but this is not as much prevention as finding out who is at fault, IMHO.