Hi everybody. I would like to know until what point fog can prevent a taking-off. A friend of mine was taking the plane this morning, and there was so much fog that we could hardly drive to the airport. Is a plane such an A319 or A320 able to take up under such conditions? (We have the highest category of ILS here if this makes a difference for your respons.)
Thanks for your answers.

Here in the US, and depending upon what a particular airline may have in their FAA approved Operations Specifications (Ops Specs), minimum takeoff visibility could be as low as 300 feet RVR. The usual is 600 RVR or 1600 RVR, depending upon the airport.

Hi Crcri, Buzz here. Sometimes it's not the leaving, it's the return......
One problem with leaving in really ugly fog is that if you need to come back in a hurry (engine fire, hydraulic loss, electrical failure) what airport can you find to divert to? I f nothing close by is good enough to land at, then you have to act like your destination is ...... Here!
One of my pen pals flies 727's out of Chicago. Our 727's are Cat 2 airplanes, late '70's electronics. So you're allowed 1/4 mile visibility and 100 foot ceiling. Face it , you see the runway lights maybe 8 or 10 seconds before you're in them. Her humorous way of saying it is "Fog's no problem. The airport's in the same place we left it." g'day