We operated the B757/767 to Cat 3C with no DH and an RVR of 75m (really just so we could see to taxi in) which brings me nicely to the leader cable idea.
We had a leader cable housing on the RAF Argosy in the sixties but never used it. I suspect trials may have been carried out but it wasn't introduced into general service. Would have been great in very poor vis with ATC monitoring ground movement radar and operating the points
