VTT's system makes use of an entirely novel, real-time method of obtaining information on a road's actual slipperiness. Transmission of slippery road warnings to vehicles via, for example, SMS messages has been tested before but, lacking the information now available, warnings have been based on estimates derived from sources such as weather forecasts. Thanks to the new system, it is possible to obtain direct information on road conditions.
Slipperiness detection is based on a method developed by VTT, whereby changes in road conditions are detected in real time, based on data collected by the car's own sensors. The method entails estimating the difference in the speeds of the drive shaft and freely rotating axles in various driving situations, which enables deduction of the level of friction.
Cinematography by Aleksi Humalainen
Production by Magneetto Media