I have the map explored at 100%. It took me over two weeks in-game, to explore every city and road from 92% and something to complete it. No trailer attached, fastest Volvo and a lot of speeding tickets and red light passes. The thing is some parts of the map are hidden and only visible at the maximum zoom level, which is not feasible for searching the whole map. Some tip and tricks to look at:
- explore every city and every company, rest hotel, bus station, truck service and so on
- some companies outside the cities
- a lot of gas stations in Britain and a few in Germany, Poland and Austria
- some parts on a small road to Italy from Swiss
- also pay attention to some roads (bridges) in Germany and Poland which you have to pass over them on both ways
- some toolbooth ramps in France and Italy
- and the final one, which bugged me at 99,6%, the road from Amsterdam to Groningen, when you pass over the storm dam, you have to pass it both ways.