Highroads Course[1] 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 / 54.2465194; -4.4658833 For the 1906 Tourist Trophy Race the Highroad course was amended to a distance of 40.38 miles to prevent disruption to railway services.