how do you land a plane in low visibility conditions?
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Firstly the runways have very powerful spotlights that is designed to be visible even though haze and fog. These not only tell the pilots where the runway is but the colors of the light is different depending on the direction so the pilots is able to see if they are within the optimal glide path or not. In addition to the spotlights the runways also have radio beacons which also send out different radio signals in different directions so that the pilots can use their radio navigation instruments to see where they are in relation to the glidepath. The radio signals are not much affected by rain or fog and can therefore be used in any conditions. In order to know how far they are from the runway they have a radar pointing down measuring the distance to the ground. And lastly modern aircraft have very good Inertial Navigation Systems and Global Positioning Systems so they know exactly where they are and by extension where the runway is.
Pilots use a combination of these systems to land safely even in low visibility conditions.
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