Road weather information system

A road weather information system (RWIS) comprises remote automatic weather stations (AWSs) – often technically referred to as environmental sensor stations (ESSs), as they also cover non-meteorological variables – a communication system for data transfer, and central systems to collect field data from numerous ESSs. These stations measure real-time atmospheric parameters, pavement conditions, water level conditions, visibility, and sometimes other variables.

Source: Wikipedia — Road weather information system (CC BY-SA 4.0)