Troops save lives on 'roof of the world'

Members of the People's Armed Police Force spend their working lives repairing dangerous roads and safeguarding travelers. Zhang Yangfei reports from Nyingchi, Tibet autonomous region.

Editor's note: This is the third in a series of stories about the Tibet autonomous region, focusing on the area's history, the cultural and business sectors and poverty alleviation measures.

Imagine driving along a narrow mountain road where one side is a wall of rocks that could tumble down at any minute and the other is a steep drop into a deep, fast-flowing river.