So having had my first proper commute in snow / ice, I'm loving my Schwalbe Marathon Winter 35C tyres. However I found that in the tyre tracks of buses / lorries the snow was forced into ice matching the tyre tread which made the ride very bumpy and pretty dodgy with the bike dancing over the tracks. On flat ice I could happily build up speed and the bike felt solid, however with a slight snow covering and in slush it felt a little unsteady.
Also later in the day when some of the snow had melted there were just these lumps of ice left from the tyre tracks - riding over these was very dangerous and I had to make sure I spotted them in time to avoid having to really hold the bike steady as it again danced about over them.
I am running a fixed gear bike with a front disc brake, my speed modulation was fine without any skidding. I'm thinking about lowering my tyre pressure to 35psi, I'm not sure what it is at now, but it is around 50 I'd say. I don't weight much so this shouldn't be an issue I hope (at least that is what I have understood from reading the forum!).
My question is how do you all deal with bumpy ice riding, and riding in slush? Is there some technique to it (holding the bike firmly / letting it go a little)?