A Road Weather Information System ( RWIS ) included automatic weather stations (technically Referred to as Environmental Sensor Stations (ESS)) in the field, a communication system for data transfer, and central systems to collect field data from Numerous ESS. These stations measure real-time atmospheric parameters, pavement conditions, water level conditions, and visibility. Central RWIS hardware and software are used to process comments from ESS to Develop nowcasts gold forecasts , and display gold Disseminate road weather information in a size That Can Be Easily interpreted by a manager. RWIS is a vehicle for the decision making.  Real-time RWIS data is also used by Automated Warning Systems (AWS). The spatial and temporal resolution can be of a mesonet . The data is often considered proprietary although it is often ingested into numerical weather prediction models .
- Thermometer for measuring temperature and pavement conditions
- Anemometer for measuring wind speed
- Wind vane for measuring wind direction
- Visibility sensor for detecting fog and smoke
- Rain gauge for measuring precipitation
- Jump up^ US FHWA Road Weather Management FAQ