Alain Prost wins fourth world title for Williams, then quits F1 • Ayrton Senna wins five races for McLaren with Ford-powered MP4-8, before moving to Williams • Kyalami hosts its last grand prix • Max Mosley succeeds Jean-Marie Balestre as FIA president • FIA bans all driver aids in F1 from the season's end, including traction control, ABS and active ride • British racing legends James Hunt and Innes Ireland die of natural causes within weeks of each other • Nigel Mansell wins IndyCar title at first attempt • Paul Radisich wins first ever FIA World Touring Car Challenge at Monza • Reigning NASCAR champion Alan Kulwicki is killed in a light aircraft incident, and Davey Allison dies in a helicopter crash later in the year • Juha Kankkunen takes a record-breaking fourth WRC title with Toyota
Alain Prost wins his fourth and final world championship
Ayrton Senna wins five times before leaving McLaren for Williams at the end of the season
Nigel Mansell wins the IndyCar title at the first attempt
Juha Kankkunen becomes the first driver to win four World Rally titles
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