trial for motor-cycles the day after for a team to represent Great Britain in the International Motor-Cycle Cup Races. The inability of the motorcycle competitors to climb the steep primary A18 Snaefell Mountain Road section of the course forced the organisers to use a section of the Gordon Bennett Trial course. For this reason, the 1907 Isle of Man TT Race used the St. John's Short Course. The 1906 Isle of Man Tourist Trophy Race for automobiles the Highroad Course was reduced from to . For the 1908 Tourist Trophy race for automobiles, the course was again reduced to with the removal of the Peel and Sandygate loops and was known as the Four Inch Course. The name of the course derives from the regulations for the 1908 Tourist Trophy adopted by the Royal Automobile Club which limited the engines of the competing automobiles to a cylinder diameter of . The Four-Inch Course was adopted by the Auto-Cycle Club for the 1911 races. The Four-Inch Course subsequently became known as the Isle of Man TT Mountain Course or TT Course when used for motor-cycle racing. Course changes: 1920–1939 For the 1920 Isle of Man TT, changes were made to the Mountain Course and competitors turned left at Cronk-ny-Mona and followed the primary A18 Mountain Road to Governor's Bridge with a new start/finish line on Glencrutchery Road which lengthened the course from the pre-World War I length of to . An extensive programme of road improvements occurred to many roads in 1922 by the Highway Board including the Mountain Course with road widening at Sulby Bridge, from Port-e-Chee on the A1 Peel Road to Braddan Bridge and part of the main road through Crosby. Modification of Signpost Corner including rounding off the bend occurred in 1922 along with further road widening at Governor's Bridge with the completion of the link road to A2 Glencrutchery Road/Governor's Road and the removal of fence posts at Keppel Gate. Further changes to the course followed in 1922 with the adoption of a private road part of the Ballastowle Estate between Parliament Square and May Hill in Ramsey. The course had previously had negotiated the A2 Albert Road and Tower Road in Ramsey and the new course length was now . The official course distance for the Snaefell Mountain Course was amended in 1938 to which is the current course length. For the 1934 Isle of