The Isle of Man TT (Tourist Trophy) Race is a motorcycle racing event hel on the Isle of Man since 1907. The race is run in a time-trial format on public roads closed for racing by the provisions of an Act of Tynwald (the parliament of the Isle of Man). The first race was held on Tuesday 28 May 1907 and was called the International Auto-Cycle Tourist Trophy. The event was organised by the Auto-Cycle Club over 10 laps of the St. John's Short Course of 15 miles 1,470 yards for road-legal touring motor-cycles with exhaust silencers, saddles, pedals and mud-guards.