Highland Course
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| Location | Douglas, Isle of Man |
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| Time zone | GMT |
| Major events | Gordon Bennett Trial, Tourist Trophy |
| Length | 52.15 mi |
| Turns | 420+ |
| Lap record | 1 hour 31 mins, 9.6 sec (34.2 mph) (John Napier, Arrol-Johnston, 1905) |
Highroads Course was a road-racing circuit used for the Gordon Bennett British Eliminating Trial held in the Isle of Man for the 1904 and 1905 Tourist Trophy Race involving touring automobiles and cars. The events were held on public roads closed for racing by an Act of Tynwald (the parliament of the Isle of Man).
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:
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″N 4°27′57.18″W / 54.2465194°N 4.4658833°W
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:
Motor racing began on the Isle of Man in 1904 with the Gordon Bennett Trial and was originally restricted to touring automobiles. As the Motor Car Act 1903 placed a speed restriction of 20 mph on automobiles in the United Kingdom, the Secretary of the Automobile Car Club of Britain and Ireland approached the authorities in the Isle of Man for the permission to race automobiles on public roads. The act approved by Tynwald, the Highways (Light Locomotive) Act 1904, gave permission for the 52.15 mile Highroads Course for the 1904 Gordon Bennett Car Trial.
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