Help from above

摘要

Road weather sensors are widely used in road weather information system (RWIS) applications and, to a lesser extent, as components of recent weather-responsive advanced transportation systems.rnSensors that focus on the condition of the roadway pavement are generally of two types: in-pavement and noninvasive. In-pavement sensors are puck-shaped sensors that are set into the roadway, while noninvasive sensors use infrared spectroscopy principles to measure road-surface conditions from above the roadway. Both types of road weather sensors can measure important parameters such as pavement temperature, precipitation occurrence, precipitation type and depth of precipitation. In practice, the two types of weather sensors are used in conjunction with the RWIS applications.