Can the plane take off in foggy weather?

The plane can't take off in foggy weather, so it will be cancelled or delayed. When the weather is bad or the pilot can't use visual judgment for reference, the pilot can rely on the instrument landing system to guide the plane to land nearby, that is, the so-called "blind landing", which is essentially the instrument landing system.

Meteorological problems that have a great impact on aviation are:

Clouds, fog, precipitation, smoke, haze, sandstorm and floating dust will reduce visibility. When the horizontal and oblique visibility of the airport drops below the critical value, resulting in line-of-sight obstacles, it will be difficult for the aircraft to take off and land. When the horizontal visibility is less than1500m, the runway sight distance should be observed at the airport with instrument landing facilities. Although the aircraft can land in low visibility in airports with instrument landing system, it is difficult for the aircraft to land in larger airports in the world when the runway sight distance is less than 400 meters and the judgment height is less than 30 meters.