Remote Sensing Sensors              Embedded Sensors

Road surface condition sensors are categorized into remote sensing and embedded types:  

- Remote Sensing Sensors: Based on optical principles, these sensors detect the dry, wet, and moist conditions of the road in real time by comparing the spectral information reflected from dry surfaces with that obtained under various conditions such as water, ice, and snow. They can accurately measure road temperature, water film height, ice layer thickness, snow depth, freezing point temperature, ice content, salt content, and friction coefficient, effectively determining the road's dry or wet status.  

- Embedded Sensors: These sensors integrate multiple measurement probes that make direct contact with the road surface. They measure road temperature, water film height, freezing point temperature, ice content/percentage, salt content, and friction coefficient, accurately assessing the road's dry or wet conditions.