China put operation red robot over 1m tall at ceiling of road tunnel  in direction of Chongli and Jinjiazhuang Extra Long Tunnel in Hebei section of Yanchung expressway.

Tunnel robot collect real time data on tunnel environment and traffic operation condition.   If fire burn in tunnel robot can quickly find accident site. Robot provide real time data. Analyze air quality. Give instructions to people in tunnel.

http://www.irobotnews.com/news/articleView.html?idxno=25954