Yes, they do still salt the roads but not much this year because it hasn't got too cold yet, it just keeps raining all the time. I have no idea what I have gone through, but a lot of tipper trucks use that road and it's always dirty and damp, it's a short cut and I used it because I was in a hurry.
Once in a blue moon our tarmac gets soft and yes, it is slippy! Have you ever tried nail varnish remover to shift it? Be carefull on paint obviously, but it seems to dissolve most things I've tried it on. Cheers!