 In 1911 the Four Inch Course was first used by the Auto-Cycling Union for the Isle of Man TT motorcycle races.This included the Creg-ny-Baa section and the course later became known as the 37.73 mile Isle of Man TT Mountain Course for motor-cycle racing which has been used since 1911 for the Isle of Man TT and from 1923 for the Manx Grand Prix races.To enable motor-cycle and sidecar racing on the new Clypse Course for the 1954 Isle of Man TT Races, during the winter of 1953–54 road widening and re-profiling occurred on the TT Course at the Creg-ny-Baa road junction along with nearby Signpost Corner, Cronk-ny-Mona and the approach to Governor's Bridge by the Isle of Man Highway and Transport Board.