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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