Portable temperature information system for warning unexpected changing road conditions e.g. snow formation to driver of passenger car, has unit computing frost point from humidity and temperature, where system measures surface temperature

摘要

The system has a computing unit computing a frost point from air humidity and air temperature in association with a programmed air pressure value, where the system continuously measures surface temperature of a roadway (101) below a vehicle (100) during driving without contact and simultaneously measures the air humidity in association with air temperature. The surface temperature of the roadway is displayed in a display unit continuously for a driver of a vehicle depending on a threshold value of the air temperature.