A system consisting of meteorological components strategically located alongside the highway, which allow the owner to make more informed decision during winter storms. Specialized equipment and computer programs monitor air and pavement temperature to make forecasts regarding how the winter storms impact the highways. The principal components of RWIS include pavement sensors, atmospheric sensors, remote processing unit (RPU), and central processing unit (CPU).

Road Weather Information Systems. Provides real-time atmospheric weather data, pavement temperature and surface conditions. As part of ITD's Road Report, the RWIS site features web cam photos from 15 locations in Idaho , plus sites in Montana , Oregon , Utah , Washington and Wyoming . Links to weather forecasts, weather warnings, and radar and satellite images also are available. More

Road Weather Information System