World highest road tunnel opens to traffic

The Huashixia-Jiuzhi highway opens to traffic in northwest China's Qinghai Province, on November 13, 2017.

It has the world's highest tunnel that runs through unstable rocks.

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The Huashixia-Jiuzhi highway opens to traffic in northwest China's Qinghai Province, on November 13, 2017.

It has the world's highest tunnel that runs through unstable rocks.

(Photo provided to China News Service)

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The Huashixia-Jiuzhi highway opens to traffic in northwest China's Qinghai Province, on November 13, 2017.

It has the world's highest tunnel that runs through unstable rocks.

(Photo provided to China News Service)

The tunnel, 4,400 meters above the sea level and 9,065 meters long, is a part of the highway linking Qinghai with northwest China's Xinjiang Uygur Autonomous Region and southwest China's Sichuan Province.