My bike is strictly grounded! There is a serious lack of friction out there.
The worst position Ive ever been in was turning off a well salted Queensway in Brum onto a side road that climbed a steep hill and, at one point, it was touch and go whether I was going to make the top of the hill or slide backwards into the main route. The horrible thing was - the further up the hill I got the more disastrous it would be if I lost it!
It always amazes me when driving in heavy snow in the dark and there is someone tailgating. They overtake and then realise why you were going slow - because its scary!