Luftt Intelligent Road Surface Sensor

Lufft's IRS31 Intelligent Road Surface Sensor is a passive sensor embedded in the monitored road surface, flush with the surface, to provide measurements of actual road conditions.

The IRS31 is a primary component of aRoad Weather Information Stations (RWIS). Two IRS21 sensors are typically installed at each measurement site.


The IRS31 measures the following parameters:

  • Road surface temperature
  • Water film level (up to 4 mm)
  • Freezing temperature for NaCl (others on request)
  • Road condition (dry/damp/wet/ice or snow/residual salt/freezing)

The sensors use radar techniques to measure water film.

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