Oddly, it was the snow in Estonia which made me realise this. I was there a few years ago on an educational jaunt (we went to Tartu for a week, travelling by coach from Tallin). The snow was compacted into a new road surface, unbroken white, and the drivers just getting on with it as if it was a normal day - which of course for them it was at that time of year. And heavens, yes, it's so *very* flat!