Due to the nature of the track, narrow, twisty and often dusty because of under-use, the Hungarian Grand Prix is associated with processional races, with sometimes many cars following one another, unable to pass. Thierry Boutsen demonstrated this in 1990, keeping his slower Williams car in front of championship leader Ayrton Senna, unable to find a way by. Pit strategy is often crucial; in 1998, Michael Schumacher's Ferrari team changed his strategy mid-race before Schumacher built up a winning margin after all the stops had been made.