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speedway racing, automobile or motorcycle racing on a racecourse or track, usually oval and flat. Both speedway racing and Grand Prix racing, which is done on closed highways or other courses partly simulating road conditions, began in 1906. Speedway racing became the dominant kind of automobile racing in the United States. For the position of speedway racing in the history of automobile racing, see automobile racing. Speedway racing for motorcycles began much later, originating in...