PROCESS FOR DETERMINING THE CONDITION OF A ROAD SURFACE

摘要

The condition of a road surface in respect of dryness, wetness or icing is determined by contactless measurement of the reflection of light in the infrared range. The reflected light is measured selectively in at least two wavelength ranges (58, 59) simultaneously by a receiver (20). The detection wavelength ranges (58, 59) have a spectral dependence on the surface condition. The quotient of the detected signals is a reliable indication of the corresponding road surface condition.