Field Trials 2006/2007

The Weather Model and the Car data Model confirm each other in most cases, hence we draw the conclusion that the Car data Model works to show slippery road conditions.

• When the Weather Model indicates Very Slippery the cars generates many slippery signals.
  
  
• When the RWIS indicates Moderate hoarfrost the cars generate significant but few slippery signals.
  
  
• When the RWIS indicates moderate, but varied slipperiness the cars generate a varied amount of signals.

But there are also occasions where the two models contradict each other.

• The Weather Model indicates Very Slippery while the cars do not generate any signals. Our conclusion is that winter maintenance has been performed. These activities are not registered in the Weather Model but are obvious through the Car data Model. The Car data Model is hence an important complement to the Weather Model.
  
  
• The Weather Model indicates no slipperiness, while the cars generate signals. Our conclusion is that there are specific weather situations that are not classified as slippery occasions but that in fact creates slippery roads. The Car data Model works as a complement to the Weather Model in this situation as well.

Download report from September 2007.