Well, what if you have to fly to a TO alternate? you're not going to try below minimums approaches?
Operators in the US with certain equipment requirements met may now apply for RVR 3 TO minima as part of OpSpecs approval to certain suitably equipped airports this will put you below Cat II or IIIa approach minima
In the US that may be some uncomfortable waiting, for two-engined airplanes that can be up to an hour and that is for still air and normal cruise speed---if under the FAR 121 or 135