The A18 Mountain Road was developed in the mid-19th century from a number of pre-existing roads and bridle paths. This included the building of a number of sheep-gates including the East Mountain Gate, the Beinn-y-Phott sheep-gate and Keppel Gate. The section of road from Keppel Gate to Park Llewelyn is a product of the Disaforesting Commission of 1860. Contemporary photographs of the Isle of Man TT races in the 1920s and 1930s show a sheep-gates at nearby Kate's Cottage and also at Keppel Gate. In the recent building of a TT Marshals' shelter at Keppel Gate, the original stone gatepost from Keppel Gate was incorporated into its design.