I played this at Essen bought some on the spot! I'm a rallying fan and this is a very good game and pretty good simulation too.
After drawing your rally-track (by connecting sides of 1,2,3 or 4 boards that are each double-sided, one side with asphalt, and the other side with snow) you begin the race.
The movement system is simple : each die rolled, you advance one space. So you have 5 dice for each of the speeds and 2 of 'gas' to continue moving without changing your speed. Each die is playable once and only once each turn. When you stop your movement, you take a card corresponding to the last speed that you started: the higher your speed, the lower your time.
At the end of each round, each player adds his times for his total time. The winner is the player who accumulates the least time in total.
I currently only have 3rd Edition still in stock. For what it's worth, I prefer this edition. Once sold out, only will be 4th Ed. Jean-Christophe has pretty much sold out of 3rd.