Airport Engineering
In Instrumental landing system, the middle markers are located

About 1 km. ahead of the runway threshold
Along the extended centre line of runway end
At the runway threshold
About 7 km. ahead of the runway threshold

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Airport Engineering
The capacity of parallel runway pattern depends upon

Lateral spacing between two runways, weather conditions and navigational aids available.
Lateral spacing between two runways and navigational aids available
Weather conditions and navigational aids available
Lateral spacing between two runways and weather conditions

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