Check out the ARTBA 2021 Bridge Report Which shows that 220,000 US bridges need repair. The National Bridge Inspection Program (NBIS) sets inspection intervals for bridges according to certain criteria, and classifies bridge inspections into 5 types:
Wireless Displacement/Crack Meter Sensor Archive

Deployment of Temperature SenSpot in a tunnel in Calgary
The trip to Calgary was fun for the most part but the cold! Just imagine how hard it could be to work for the whole day outside when temperature is below -20 °C.
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