I taxied out from the old circular space station terminal (still T1 ? can't remember ) once at CDG for departure on 09L. RVR was above the 125 we needed to go (although probably not by much) Taxying uphill from satellite 3 we had to stop, as (even in a 737) we literally couldn't see enough to continue. I imagine 75m in a 757, never mind a 777/747/A380 doesn't give much in the way of slant angle/vis to proceed anywhere at any rate at all.