Three-time Formula One World Champion Ayrton Senna died on 1 May 1994, as a result of his car crashing 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 and the Grand Prix Drivers' Association to be re-established.