High Quality Content by WIKIPEDIA articles! The 1986 Australian Grand Prix was a Formula One motor race held on 26 October 1986 at the Adelaide Street Circuit, Adelaide, Australia. It was the last of 16 races in the 1986 Formula One season. The event itself was remembered as the race that decided the Drivers` Championship for that season, particularly for it being a three-way tussle for the title and the dramatic manner in which it was settled. The drivers in contention for the title were; Nigel Mansell, Nelson Piquet, both of whom were racing for the Williams-Honda team, and McLaren`s Alain Prost.