Racing deaths (i.e. riders only) on the Mountain Course, by year (1910–2017) This list is of fatal crashes on the Isle of Man TT Mountain Course used for the Isle of Man TT races, Manx Grand Prix and Classic TT races.[1] The TT Course was first used as an automobile road-racing circuit for the 1908 Tourist Trophy event for racing automobiles, then known as the Four Inch Course.[2] For the 1911 Isl