Category 3 instrument landing systems permit landings with very low visibility, but as TopCat has pointed out, if the pilot cannot see the ground then they will be unable to taxi to and from the runway.

As far as I know, there is no official auto-takeoff system that would ensure the plane remains aligned with the runway during its takeoff roll, hence in poor visibility if the plane was mis-aligned by even one degree or so, without proper yaw control it would soon end up on the grass!

It used to be a plane landing every 50 seconds at Heathrow but not sure if the take off schedule is the same.

Hard enough driving in foggy conditions so I would imagine landing and taking off in a plane on those conditions would be a nightmare.

Today we have night glasses that can let you see in the dark so maybe something like that which could let you see in foggy conditions would be ideal.

A bit of snow or fog and they all grind to a halt,Like the FE states surely in this day and age they could come up with something that would work.

All things are possible, but would the airlines be willing to pay the extra charges?

As we saw last winter, airlines/airports (it's the airlines, i.e. the passengers, who pay in the end) are reluctant to invest even in simple things like snowploughs because they don't get used very often and simply represent money not earning interest.

How much more reluctant would they be to spend the sort of money needed to equip every aeroplane with its own "fogplough".

The laws of physics demand that fog dispersal requires heat and/or wind, both of which which be prohibitively expensive to produce artificially on the scale required.

FIDO was only ever used for landing, not take off, and then only in life or death emergency, for crippled or out of fuel aircraft which has no other options except crashing.

Only certain designated airfields had it, and as has been said, it was phenomenally expensive on fuel, and if any damaged aircraft happened to be leaking fuel (only high octane Avgas in those days) the outcome was usually poor.

It's the time taken to clear the runway this blog Finnair Blog and this site help explain Federal Aviation. I have experienced fog in an aircraft not equipped to land in it but I also have had experience of a severe dust storm and that was far worse as it potentially damages the engines. Remember "time to spare ... fly by air".