The Mountain Mile is a 1.3 mile (2.09 km) section of a purpose-built graded road situated between the 27th and 29th Milestone roadside markers on the Snaefell Mountain Course used for the Isle of Man TT and Manx Grand Prix races on the A18 Mountain Road in the parish of Lezayre in the Isle of Man.
The primary A18 Mountain Road section from Park Lewellyn (North Barrule) to Keppel Gate is a product of the Disaforesting Commission of 1860.
[2] This section of the A18 Mountain Road was purpose built, reflecting typical nineteenth century highway and railway construction practices with many small scale cuttings, embankments and revetments which follows land contours with purpose built graded-sections.
[3] The Mountain Mile was part of the Highland Course and Four Inch Course used for the Gordon Bennett Trial and Tourist Trophy car races held between 1904 and 1922, since 1911 for the TT, and from 1923 for the Manx Grand Prix races.
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