The event has been marred by tragedy several times, involving driver fatalities such as Wolfgang von Trips, Jochen Rindt and Ronnie Peterson, but also a fatal accident involving a trackside marshal in 2000, and multiple spectators being killed in von Trips' fatal accident in 1961. Monza is an extremely fast circuit that has been modified with three chicanes to curb speeds, but is still the fastest circuit on the Formula One calendar and is considered too fast to be considered to host MotoGP and no longer holds Superbike World Championship events either. When it hosted the Italian motorcycle Grand Prix it saw a double fatal accident for Jarno Saarinen and Renzo Pasolini in 1973 after a pile-up through the dauntingly fast "Curva Grande", that has since had significant runoff added to it. Italy's last Formula One champion Alberto Ascari also died at the Monza circuit in 1955, but it was during a test of a road car rather than during a race.