Three-time Formula One World Champion Ayrton Senna died on 1 May 1994 after his car crashed into a concrete barrier while he was leading the 1994 San Marino Grand Prix at the Autodromo Enzo e Dino Ferrari in Italy. The previous day, Roland Ratzenberger had died when his car crashed during qualification for the race. His and Senna's accidents were the worst of several accidents that took place that weekend and were the first fatal accidents to occur during a Formula One race meeting in twelve years. They became a turning point in the safety of Formula One, prompting the implementation of new safety measures in both Formula One and the circuit, as well as the Grand Prix Drivers' Association to be reestablished. The Supreme Court of Cassation of Italy ruled that mechanical failure was the cause of the accident, although this has been disputed.
Senna's fatal accident just after the moment of impact at the Tamburello corner of the Imola circuit
