How China turned one of its toughest mountain crossings into an 18-kilometre tunnel with an artificial sky to keep drivers safe

China's Qinling Zhongnanshan Tunnel features an artificial sky to combat driver fatigue. This innovative lighting system simulates daylight, easing anxiety for motorists underground. The 18-kilometer tunnel significantly reduced travel time through a challenging mountain range. Engineers incorporated advanced safety features and ventilation systems for secure passage. This project demonstrates engineering focused on both infrastructure and human comfort.

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