The Calgary Trail tunnel sensor installation has been completed and will provide the owner/operator 24/7 data from over 120 temperature channels, expansion joint displacement meters and 3D movement of tunnel sections.

All sensors are connected wireless and have an estimated live of 20+ years without changing batteries.

http://www.cbc.ca/news/canada/calgary/calgary-airport-tunnel-on-track-to-open-may-2014-1.1401715