We carried on through the fog and eventually came across the Czech border post.  We stopped before the border to change some money and buy a motorway pass.  This was our first ‘manned’ border crossing.  Showed lots of people our passports and were then waved through without hassle or questions.  If only all our border crossings are like that.  We arrived at the campsite in Prague at 5ish and were apparently the only people staying!