Kuntunnelin valaistuksen suunnittelu, people's light adaptation and dark adaptation factors should be taken into account, and attention should be paid to the design of transition space and transition lighting. In order to meet the requirements of eye adaptability, a period of light and dark transition lighting is required at the entrance of the tunnel to ensure certain vision requirements. The adaptation time at the tunnel exit is very short, generally within 1S, so no other treatment is required. Moreover, tunnelin valaistuseroaa muista tievaloista, ja siinä on seuraavat erityiset visuaaliset ongelmat:
Before entering the tunnel (daytime): Since the brightness inside and outside the tunnel is very different, from the outside of the tunnel, the tunnel entrance with insufficient lighting will see a "black hole" phenomenon.
After entering the tunnel (daytime): After the car enters the tunnel from the bright exterior, even if it is not too dark, it takes a certain period of time to see the inside of the tunnel, which is called the "adaptation lag" phenomenon.
Tunnel exit: During the day, when a car passes through a long tunnel and approaches the exit, the exit looks like a "bright hole" due to the extremely high external brightness seen through the exit, and there will be extremely strong glare, which makes the driver feel extremely uncomfortable. Adaptation: Nighttime is the opposite of daytime. What the tunnel exit sees is not a bright hole but a black hole, so that the driver cannot see the line shape of the external road and the obstacles on the road.