Provision of state recognition of a road.

The invention relates to a system for recognizing road conditions, especially for use in motor vehicles and includes a system transmitting / receiving infrared. Advantageous measures by which is possible to separate fractions signal at different intervals the infrared wavelength included. This allows a reliable assessment of the conditions of a section of road being examined using a simple and inexpensive device. Infrared devices are preferably combined with microwave devices.