KTW
EPKT/KTW airport runway when wet, or snowy is very slippery. Or at least it was when I was based there for 12 months in 2009/10.
It was at the time, a block paving former Eastern bloc type runway. Not sure whether it still is, but I suspect so.
Our airport briefings package was updated to a CAT B airport status, in order to reflect this phenomena. I believe that Ryanair also followed suit - or at least made reference to this in their subsequent crew briefs.
It looks a nice, long runway. But, the reality to based crews was that when the above conditions existed was that the runway was deemed about 25 - 33% shorter than declared TODA/LDA.