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Short note: importance of lighting in tunnel

Short answer

Tunnel lighting prevents the black-hole effect as drivers enter from bright daylight, enabling safe vision. It uses a sequence of luminance zones (threshold, transition, interior, exit) for eye adaptation. Proper illumination ensures traffic flow at design speed, reduces fatigue, and supports emergency evacuation.

Write a short note on importance of lighting in tunnel.

Lighting in a tunnel is important for safe driving and easy adaptation of the eyes.

  • Daytime drivers moving from bright outside into a dark tunnel suffer the black-hole effect; lighting reduces temporary blindness and accidents.
  • Gradual luminance reduction (threshold, transition, interior and exit zones) lets the eye adapt.
  • It lets drivers see the road, obstacles, signs, and pedestrians, so traffic flows at the design speed.
  • It gives comfort and reduces fatigue in long tunnels, and helps maintenance staff work.
  • Emergency lighting helps evacuation and rescue in power failure or fire.
  • Good lighting design follows CIE 88 and IRC:SP:91 with energy-efficient luminaires like LED lamps.

✓ Answer checked by Claude Opus 5.5 (high effort)

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