The perimeter lighting at the airports should be provided on the

The perimeter lighting at the airports should be provided on the

inner side of the airport along the perimeter road and focusing towards the perimeter fencing/wall.
top of the perimeter wall focusing outside the perimeter.
top of the perimeter road and focusing inside the perimeter.
top of the watch-towers focusing outside the perimeter wall.
This question was previously asked in
UPSC CISF-AC-EXE – 2020
Perimeter lighting at airports is crucial for detecting unauthorized entry into the airport area. The lighting should be positioned and directed to illuminate the area between the perimeter fence and the airport boundary or patrol road. This allows security personnel (often patrolling the perimeter road) and surveillance systems (like CCTV) to detect intruders approaching or attempting to breach the fence from the outside, or moving along the inner side of the fence.
The primary purpose of airport perimeter lighting is intrusion detection. Therefore, the lighting must effectively illuminate the vulnerable zone immediately adjacent to the perimeter barrier on the airport side.
Standard specifications for airport perimeter lighting require specific lux levels and uniformity across the illuminated area. The lights are typically mounted on poles along the perimeter road or just inside the fence, and are angled to cover the area between the road/mounting point and the fence line.
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