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.
This encompassed the Creg-ny-Baa section, and the course was later recognized as the 37.73 mile Isle of Man TT Mountain Course for motorcycle racing, which has been utilized since 1911 for the Isle of Man TT and from 1923 for the Manx Grand Prix events.