Detecting subtle slope angle variations on Taiwan National Freeway No.3

Country Taiwan
Sector Civil infrastructure
Project Type Slope monitoring
Main Product Monitoring solution


In Taiwan, slopes are categorised into four main types: Type A and B slopes are considered highly critical and require long-term monitoring, while Type C slopes require occasional inspections and Type D slopes do not require any monitoring.

However, in November 2022, a significant landslide occurred on a Type C slope, leading the government to introduce new regulations mandating real-time monitoring for all Type C slopes. As a result, a large-scale project was initiated on the Formosa Motorway, also known as National Freeway No. 3. Due to the proximity of the landslide to the Lunar New Year in 2023, when high traffic volumes are expected, the government urged monitoring contractors to expedite the deployment of real-time monitoring systems on these slopes before the festive season.


The objective was to proactively address any potential threats and ensure timely intervention to prevent a possible catastrophe. Faced with challenging slope movement conditions, Sanlien Technology, a pioneering Taiwanese company in slope monitoring and geotechnical solutions, implemented the LoRa wireless automated monitoring system from Worldsensing.

Sanlien Technology deployed several devices to monitor the highway slopes, including:

  • More than 100 gateways, one for each slope, powered by solar panels to avoid power outages
  • Tiltmeters, operating at a sampling interval of 15 minutes, to address the intricacies of the slope
  • Vibrating Wire data loggers for monitoring load cells

The LoRa-based solution provided real-time monitoring, enabling Sanlien Technology to detect even the slightest variations in slope angles. This level of precision helped ensure the safety of motorists and maintenance crews while minimising potential disruptions.


Thanks to the battery-powered nodes and solar panels, Sanlien Technology was able to ensure uninterrupted data collection and avoid potential power outages and cable installations. The road operator can now monitor the data 24/7 and conduct timely inspections and corrections whenever anomalies are detected.

The combined expertise in slope monitoring and collaboration in remote solutions has elevated the standards for integrating advanced technology to safeguard motorists as they travel through Taiwan’s challenging topography.

Detecting subtle slope angle variations on Taiwan National Freeway No.3

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