This dramatic video captured a huge section of a mountain collapsing after heavy rain in southwestern China.

In the clip, shot in Zhaotong City in Yunnan Province on August 5, a 400-metre-long road suddenly collapses as a large section of the mountainside comes loose.

According to reports, a man named Yang Mingkui realised a landslide was imminent when he saw cracks and loose stones on the road.

So he piled up stones and tree branches from the side of the road to make a roadblock while warning drivers to not go any further.

Thanks to Yang's foresight, more than 20 people’s lives were saved.