The city is best-known as the home of the Autodromo Enzo e Dino Ferrari which formerly hosted the Formula One San Marino Grand Prix (the race was named after the independent nation of San Marino which is around 100 km. to the south), and the deaths of Formula One drivers Ayrton Senna and Roland Ratzenberger at the circuit during the 1994 San Marino Grand Prix. The death of Senna (three-times world champion) was an event that shocked the sporting world and led to heightened Formula One safety standards.