Västerbron in central Stockholm is a steel arch road bridge and is one of the major bridges in Stockholm, opened in 1935. It is also famous for being the toughest passage of the Stockholm Marathon. A wireless sensor system was installed during summer. The system consists of 5 strain gauges, 1 inclinometer, 2 three directional accelerometers and 1 temperature sensor. The IoTBridge Bridge Monitoring System is used. This includes sensor integration modules, wireless gateways, communication modules, MQTT Message Broker, GOST database for aggregation and storage of measurements and cloud infrastructure with algorithms and machine learning modules. A machine learning method has been successfully developed by IoTBridge and KTH Royal Institute of Technology in Stockholm to improve the accuracy in damage detection using accelera
