Aerial photo taken on Feb. 4, 2018 shows a police car patrolling on a road in Meihua Mountain, southwest China's Guizhou Province. The S102 provincial highway is the highest one in Guizhou, which is also a vital line to reach Yunnan and Sichuan provinces. Thus, it is significant to ensure the smooth running of the road, especially during winter time. (Xinhua/Tao Liang)

Aerial photo taken on Feb. 4, 2018 shows the road in Meihua Mountain, southwest China's Guizhou Province. The S102 provincial highway is the highest one in Guizhou, which is also a vital line to reach Yunnan and Sichuan provinces. Thus, it is significant to ensure the smooth running of the road, especially during winter time. (Xinhua/Tao Liang)

Aerial photo taken on Feb. 4, 2018 shows a police car patrolling on a road in Meihua Mountain, southwest China's Guizhou Province. The S102 provincial highway is the highest one in Guizhou, which is also a vital line to reach Yunnan and Sichuan provinces. Thus, it is significant to ensure the smooth running of the road, especially during winter time. (Xinhua/Tao Liang)

Policemen check tyre chains of the passing vehicle on a road in Meihua Mountain, southwest China's Guizhou Province, Feb. 4, 2018. The S102 provincial highway is the highest one in Guizhou, which is also a vital line to reach Yunnan and Sichuan provinces. Thus, it is significant to ensure the smooth running of the road, especially during winter time. (Xinhua/Tao Liang)