Today I have been on the highway with a light snowstorm. The other road users probably have great respect for snow next to the highway and therefore they drove on the left lane in Kolonne 100. So I turned on my distance machine and ride comfortably afterwards. The car in front of me is now getting a little faster and the gap larger, so that my car accelerates. Suddenly however with almost full throttle. I was surprised, because the gap now not so I was even more surprised when the acceleration did not stop when the other car came closer. I could not look at the display from the ACC at the moment when my passenger telephoned with the fixed telephone and that was displayed on the display. So for safety reasons I braked at far too small safety distance. A few seconds later the message “no distance control possible h” o.ä. (I guess because of the slight snowfall). Now the car apparently wanted to speed up to Tempomat 180 (the set speed) when the distance radar failed. I think this can end very badly. Is this the “normal” procedure in case of an ACC failure? Is there perhaps an update for this? So something can not be right, in case of a mistake mMn should get a message and the Tempomat/ACC should go out immediately.