Device that generates salt-state information of a road

A road salt-state information generating device, comprising:

• a camera configured to determine salt-state-dependent measurement values through recordation of a Schlieren image on a windscreen produced by vehicle water spray;
• a processor configured to translate the measurement values into salt-state information about the road;
• and
• an output device configured to display the salt-state information.

A method that generates information about the salt-state of a road including:

• determining salt-state-dependent measurement values;
• processing the measurement values into information about a salt-state of the road;
• and
• outputting the information,
• wherein the determining of salt-state-dependent measurement values is through optical method, acoustic methods, electrical conductivity measurements, acceleration capability and electrical force feedback measurements.