监测：environmental sensor system (ESS) technology to collect data

    预报：models and other advanced processing systems to develop forecasts and tailor the information into an easily understood format

    服务：dissemination platforms on which to display the tailored information.

    RWIS的ESS（环境监测系统）的标准

    weather: air temperature, amount and type of precipitation, visibility, dew point, relative humidity, and wind speed and direction. （常规要素监测）

    surface: pavement temperature, subsurface temperature, surface condition (dry, wet, frozen), amount of deicing chemical on the roadway, and freezing point of the road surface. （地面要素监测）