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The slowest and toughest race of the year was in the United States, at the angular Renaissance Center street circuit in the center of downtown Detroit, Michigan. Ayrton Senna took pole, 1.2 seconds ahead of the next fastest qualifier, Nigel Mansell. The Lotus proved to be well-suited to slow tracks, and Senna decided to take a chance by using harder tires than the rest of the field and try to go a greater distance. Keke Rosberg passed Prost, Mansell and Senna to take the lead – a lead he kept from start to finish on a circuit that, under the intense heat and humidity, broke up and made half the field retire. Prost, Mansell and Senna all crashed at the same corner at Atwater and St. Antoine Streets. Behind Rosberg were the two Ferraris of Johansson and Alboreto, the former pushing Rosberg hard for the lead. Wikipedia:
