my st170s traction control is actually more dangerous on rather than off in the ice, i pulled away on sheet ice and all it did was splutter about and juddered, turned it off, had a little wheel spin then went fine, also coming round a roundabout with it on and started to slide a bit traction control is to harsh that it unsettles the cars stability and made the slide worse, few hours later same roundabout but with tc of went round a lil slide, just gave it more throttle and it pulled round smoothly.....I dont like electronic driving aids and the day i rely on them is the day i give up driving, same with parking sensors, on my old 170 i removed the speaker so i did not have to hear the bloody things