Road Weather Information Systems


are used to provide information about current conditions of the road in remote locations or gather specific measurements so that a detailed decision process can be followed. Decision support solutions or statistical data, such as thermal mapping provide predications of future road conditions which allows agencies to take better, quicker actions or provide information to the travelers.

INTETRA is the distributor of VAISALA for road weather solutions and offering premium quality products. Even in most developed countries more people are killed in winter traffic crashes than any other weather related disaster. Monitoring the current conditions on roadways nearby and remote motorways is critical to performing winter maintenance operations. Ministries of transportations, departments of transportation, cities, counties, and townships all have a need to monitor road weather conditions.


  • Road weather stations or RWIS monitor winter conditions such as:
  • Ice or snow formation
  • Frost on bridges
  • Black ice or refreezing of moisture
  • Depth of water or snow
  • Friction or grip
  • Chemical concentration
  • Freeze point of solution on the surface


VAISALA GUARDIAN is an innovative, non-invasive Road Weather Information System (RWIS) that costeffectively provides you with the most accurate pavement-specific weather information available. A problem with road weather has always been how to deploy a low cost road weather solution while still receiving high quality decision making information. VAISALA GUARDIAN is a complete road weather package for agencies looking for the most return on investment they can get on tight budgets. Removing uncertainty , VAISALA GUARDIAN empowers maintenance and operations personnel to remotely monitor road conditions in real-time with unprecedented levels of precision. The benefits are measured in better decisions, more timely responses, peak operational efficiency, lower costs and increased safety for the traveling public.


For more than thirty years VAISALA has been designing and advancing road weather systems. Road Weather Information Systems or RWIS are the heart of any winter maintenance strategy and provide real time road weather conditions vital to decision makers worldwide. Weather affects all modes of transportation, and Road / Runway Weather Information System (RWIS) technology provides vital information on pavement and weather conditions needed for both highway and airport maintenance operations. RWIS enables maintenance and operations personnel to monitor changing weather conditions in real time and make informed and timely decisions. An RWIS system can consist of multiple sites, each containing a suite of sensors that gather weather and pavement data and then report to a central location where authorized personnel can view the information. VAISALA RWIS stations collect atmospheric, pavement surface, sub-surface and video data remotely to provide the most accurate pavement specific weather information available.