As the combination of high speed and high downforce caused tyre and engine failures, two roughly equally spaced chicanes were consequently added to the Mulsanne Straight before the 1990 race to limit the maximum achievable speed. The chicanes were also added because the FIA decreed it would no longer sanction a circuit which had a straight longer than ., which is roughly the length of the "Döttinger Höhe" straight at the Nürburgring Nordschleife. The fastest qualifying lap average speed though only dropped from in 1992. In 1994, the Dunlop chicane was tightened.