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Would take a while to find you in the event of some emergency after /during landing, but that is a whole new discussion topic.
That is indeed the reason for the 75m RVR requirement. In the early Cat III discussions, the fire services at LHR argued that they would have difficulty in finding an aircraft in distress if the visibility was any less.
It was one of the reasons. Also, the minor matter of the aircraft being able to taxi to the gate.