Oops.
I'm sure you know what you did wrong... obviously 60mph would have been excessive in the dry, let alone in conditions like that. It looks very much like a 30mph zone, so I hope no police are watching.
Apart from speed, your road positioning wasn't ideal. The centre of the lane usually has slightly less grip than the bits to the left and right where the car tracks run. The middle accumulates a greasy layer from leaking sumps and truck differential gearboxes. It's not a hard and fast rule... on roads that haven't been resurfaced in a long while those zones become slightly sunken and can have a greater depth of water... in frosty conditions the warmth of passing vehicle engines can thaw the centre out first, it's all part of "reading the road". In this case I'd have said positioning closer to the crown of the road should have given you a little more grip and, as it was a left hand bend, a slightly better view. It would have also given the car driver a fraction more opportunity to spot you before he pulled out.
