Self-driving tourists pass on a grassland in Hexigten Banner of Chifeng City, north China's Inner Mongolia Autonomous Region, Oct. 3, 2014. The autumn scenery of Inner Mongolia attracted many people during the seven-day National Day holiday. Photo: Xinhua

 Tourists take pictures of the scenery on a grassland in Hexigten Banner of Chifeng City, north China's Inner Mongolia Autonomous Region, Oct. 3, 2014. The autumn scenery of Inner Mongolia attracted many people during the seven-day National Day holiday. Photo: Xinhua

Tourists ride horses on a grassland in Hexigten Banner of Chifeng City, north China's Inner Mongolia Autonomous Region, Oct. 3, 2014. The autumn scenery of Inner Mongolia attracted many people during the seven-day National Day holiday. Photo: Xinhua

Self-driving tourists enjoy themselves on a grassland in Hexigten Banner of Chifeng City, north China's Inner Mongolia Autonomous Region, Oct. 3, 2014. The autumn scenery of Inner Mongolia attracted many people during the seven-day National Day holiday.Photo: Xinhua

Tourists walk on a grassland in Hexigten Banner of Chifeng City, north China's Inner Mongolia Autonomous Region, Oct. 3, 2014. The autumn scenery of Inner Mongolia attracted many people during the seven-day National Day holiday. Photo: Xinhua