The Isle of Man TT was for many years the most prestigious motor-cycle race in the world.
Between 1907 and 2009 there have been 237 deaths during official practices or races on the Snaefell Mountain Course.
Snaefell Mountain Course or Mountain Course is a road-racing circuit used for the Isle of Man TT and Manx Grand Prix Races held in the Isle of Man from 1911 and 1923 respectively. The racing is held on public roads closed for racing by an Act of Tynwald (the parliament of the Isle of Man). It is the oldest motor-cycle racing circuit still in use. The official lap record for the Snaefell Mountain Course is 17 Minutes and 12.30 seconds at an average speed of 131.578 mph (211.754 km/h) set by John McGuinness during the 2009 Senior TT Race.