Aerial photo shows the Mila Mountain Tunnel in Southwest China's Tibet autonomous region, April 26, 2019. The world's highest highway tunnel was open to traffic on Friday at an altitude of over 4,750 meters above sea level in Southwest China's Tibet autonomous region. (Photo/Xinhua)
Aerial photo shows the Mila Mountain Tunnel in Southwest China's Tibet autonomous region, April 26, 2019. The world's highest highway tunnel was open to traffic on Friday at an altitude of over 4,750 meters above sea level in Southwest China's Tibet autonomous region. (Photo/Xinhua)
Mila Mountain Tunnel opens to traffic in Southwest China's Tibet autonomous region, April 26, 2019. (Photo/Xinhua)
Mila Mountain Tunnel opens to traffic in Southwest China's Tibet autonomous region, April 26, 2019. (Photo/Xinhua)
Mila Mountain Tunnel opens to traffic in Southwest China's Tibet autonomous region, April 26, 2019. (Photo/Xinhua)