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Fatal accidents to competitors at the Watkins Glen International Circuit during the United States Grand Prix and other national and international motorsport events on a 10.6 km (6.6 mi) road circuit (1948–1952), an amended 7.4 km (4.6 mi) circuit (1953–1956) and the 3.78 km (2.35 mi) Grand Prix circuit from 1957 onwards.