Highroads Course
The street circuit course measured 52.15 miles long from the start-line at the Quarterbridge area in the town of Douglas. The circuit was based on a number of public roads including:
A street circuit is a motorsport racing circuit composed of temporarily closed-off public roads of a city, town or village, used in motor races. Facilities such as the paddock, pit boxes, fences and grandstands are usually placed temporarily and removed soon after the race is over but in modern times the pits, race control and main grandstands are sometimes permanently constructed in the area. Since the track surface is originally planned for normal speeds, race drivers often find street circuits bumpy and lacking grip. Run-off areas may be non-existent, which makes driving mistakes more expensive than in purpose-built circuits with wider run-off areas. Racing on a street circuit is also called "legal street racing".
Douglas is the capital and largest town of the Isle of Man, with a population of 27,938 (2011). It is located at the mouth of the River Douglas, and on a sweeping bay of two miles. The River Douglas forms part of the town's harbour and main commercial port.
- The primary A5 New Castletown to Douglas road and the A3 Castletown to Ramsey road to Ballaugh Bridge.
- The primary A10 Jurby Coast Road from Ballaugh Bridge to the Ballaugh Cronk and the A13 Jurby Road from the Ballaugh Cronk to Ramsey included the A9 Bowring Road in Ramsey, this section being known as the Sandygate Loop.
- The A2 Albert Road in Ramsey centre, including a section of private road and the primary A18 Mountain Road to the road junction with the A21 road and C10 Scholag Road at Cronk-ny-Mona in Douglas.
- The primary A21 Johnny Watterson('s) Lane at Cronk-ny-Mona, the A22 Ballanard Road, A2 Bray Hill and the A2 Quarterbridge Road in Douglas.
Ballaugh Bridge,, is a hump-backed road bridge over a stream situated between the 17th and 18th Milestone road-side markers on the Snaefell Mountain Course in Ballaugh village, on the primary A3 Castletown-to-Ramsey road and adjacent side junctions with the A10 Ballaugh-to-Ramsey coast road and the tertiary C37 Ballaugh Glen Road in the parish of Ballaugh in the Isle of Man.
Cronk-ny-Mona is situated between the 36 and 37 mile markers used for the Snaefell Mountain Course, being on the primary A18 Mountain Road at the road junction with the A21 Johnny Watterson('s) Lane and the tertiary C10 Scholag Road in the Isle of Man parish of Onchan.
The highest point of the course was at Brandywell on the primary A18 Mountain Road measuring a spot height of 422 metres (1,384 feet) above sea level. 54°14′47.47″N4°27′57.18″W / 54.2465194°N 4.4658833°W / 54.2465194; -4.4658833
A spot height is an exact point on a map with an elevation recorded beside it that represents its height above a given datum. In the UK this is the Ordnance Datum. Unlike a bench-mark, which is marked by a disc or plate, there is no official indication of a spot height on the ground although, in open country, spot heights may sometimes be marked by cairns. In Geosciences, it can be used for showing elevations on a map, alongside contours,Bench marks, etc
Short Highroads Course
For the 1906 Tourist Trophy Race the Highroad course was amended to a distance of 40.38 miles to prevent disruption to railway services. The start was moved from Quarterbridge to the road junction of the A2 Quarterbridge Road/Alexander Drive adjacent to the property called 'Woodlands' in the town of Douglas. Again the course was based on a number of public roads closed for racing:
- The primary A1 Douglas to Peel road, A4 Peel to Kirk Michael coast road and the A3 Castletown to Ramsey road from Douglas Road Corner in Kirk Michael to Parliament Square in Ramsey.
- The A9 Albert Road in the town of Ramsey, including a section of private road and the primary A18 Mountain Road to the road junction with the A21 road and C10 Scholag Road at Cronk-ny-Mona in Douglas.
- The primary A21 Johnny Watterson('s) Lane, the A22 Ballanard Road, A2 Bray Hill and the A2 Quarterbridge Road in Douglas.
- The Sandygate Loop from Ballaugh to Ramsey was omitted to reduce overall course length.
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Michael Sheading is a sheading in the Isle of Man. Michael District is also a traditional parish. Michael Sheading has, according to the 2011 census, 3,568 residents. It is a mainly agricultural area on the west coast of the island. It was until 2016 a House of Keys constituency.
The Isle of Man TT Mountain Course or TT Course is a motor-cycle road- racing circuit located in the Isle of Man. The motor-cycle TT Course is used principally for the Isle of Man TT Races and also the separate event of the Isle of Man Festival of Motorcycling for the Manx Grand Prix and Classic TT Races held in September of each year. The start-line for the Isle of Man TT Mountain Course is located on Glencrutchery Road in the town of Douglas, Isle of Man.
11th Milestone, Isle of Man is situated between the 11th and 12th Milestone racing road-side markers on the Snaefell Mountain Course used for the Isle of Man TT races on the primary A3 Castletown to Ramsey Road which forms the boundary between the parishes of German and Michael in the Isle of Man.
The St John's Short Course was a road-racing street circuit used for the Isle of Man TT held between 1907 and 1910.
Bray Hill was formerly a country lane known as the Great Hill during the time of the ownership of the Duke of Atholl, and was previously known as Siberia, originally a triangle-shaped parcel of land in the Murray Estate.
Parliament Square, Ramsey is situated between the 23rd and 24th Milestone road-side markers on the Snaefell Mountain Course used for the Isle of Man TT Races on the junction of the primary A3 Castletown to Ramsey road, the A9 Ramsey to Andreas road and A2 Douglas to Ramsey road situated in the town of Ramsey in the parish of Lezayre in the Isle of Man.
The Four Inch Course was a road-racing circuit first used for the 1908 Tourist Trophy Race for cars, held on public roads closed for racing by an Act of Tynwald. The name of the course derives from the regulations for the 1908 Tourist Trophy adopted by the Royal Automobile Club, which limited the competitors' engines to a cylinder-diameter of four inches. The Four-Inch Course was adopted by the Auto-Cycle Club for the 1911 Isle of Man TT Races. The Four-Inch Course was subsequently known as the Snaefell Mountain Course or Mountain Course when used for motor-cycle racing.
Ballig is a small hamlet of a few houses situated between the 8th and 9th Milestone road-side markers on the Snaefell Mountain Course between Ballacraine and Glen Helen. It is the site of a former notorious hump-back bridge used for the Isle of Man TT Races on the primary A3 Castletown to Ramsey and the road junction with the A20 Poortown Road in the parish of German in the Isle of Man.
Hillberry Corner is situated at the 36th Milestone road-side marker on the Snaefell Mountain Course, being on the primary A18 Mountain Road with the side-road junction of the C22 Little Mill Road, in the parish of Onchan in the Isle of Man.
Quarterbridge is situated soon after the 1 mile-marker measured from the TT Grandstand, part of the Snaefell Mountain Course used for the Isle of Man TT races, at the junction of the primary A1 Douglas to Peel road, A2 Douglas to Ramsey road and the A5 Douglas to Port Erin road which forms the boundary between the parishes of Braddan and Onchan in the Isle of Man.
Ballacobb is situated between the 16th and 17th Milestone road-side markers on the Snaefell Mountain Course, on the primary A3 Castletown to Ramsey road at the side-junction with the tertiary U16 Slieu Curn Road, in the parish of Ballaugh in the Isle of Man.
Alpine Cottage including the adjacent Alpine House is situated between the 16th and 17th Milestone road-side markers on the Snaefell Mountain Course on the primary A3 Castletown to Ramsey road in the parish of Ballaugh in the Isle of Man.
Orrisdale North is situated adjacent the 16th Milestone road-side marker on the Snaefell Mountain Course on the primary A3 Castletown to Ramsey road with the nearby junction with the tertiary C19 Orrisdale Loop Road and D13 Bollyn Road in the parish of Ballaugh in the Isle of Man.
Quarterbridge Road is situated adjacent to the 1st Milestone road-side marker measured from the startline at TT Grandstand used for the Snaefell Mountain Course on the primary A2 Ramsey to Douglas road in the town of Douglas, Isle of Man.
Quarry Bends is situated adjacent to the 19th Milestone road-side marker on the Snaefell Mountain Course on the primary A3 Castletown to Ramsey, in the parishes of Ballaugh and Lezayre in the Isle of Man. Quarry Bends is the site of the Curraghs Wildlife Park, the nearby Gob y Volley Forestry Plantation and Close e Volley Depot, Forestry Division, Isle of Man Department of Environment, Food and Agriculture and the former Ballavolley Quarry.
Douglas Road Corner or Kirk Michael Corner is situated adjacent the 14th Milestone road-side marker on the Snaefell Mountain Course on the primary A3 Castletown to Ramsey Road and the road junction with the A4 Peel to Kirk Michael Coast Road in the parish of Michael in the Isle of Man.
