From GTPlanet Game Guides

Twin Ring Motegi is an automobile racing track located in Motegi, Japan. Its name comes from the fact that there are two race tracks at the facility: a 1.5 mile oval (2.414 kilometers) and a 4.8 kilometer (2.983 miles) road course. It was built in 1997 by Honda, as part of Honda's effort to bring Indycar racing to Japan, as well as increase their own knowledge of that form of racing.

Motegi Road

The road course is 4.8 kilometers long, and is unique in sharing garage and grandstand facilities with the oval course, but being entirely separate otherwise. Although they are separate tracks, it is impossible for races to occur simultaneously on the two courses at the same time; to access the oval track, teams must cross the road-course pit and front straight. The road course also runs in the opposite direction from the oval; clockwise, rather than counter-clockwise.

The course itself is a fairly conventional modern road course, with 11 turns, and by Japanese standards is exceptionally flat, with only a slight elevation rise towards the hairpin turn. The road course is much busier than the oval track, with Formula Nippon visiting twice, Super GT and Super Taikyu cars once each, and local events almost every weekend. The road course can be used in three ways: the full course, or two 'Short Courses' can be made, using connecting roadways. These short courses are usually used for junior formula events, such as Formula 4 or FJ1600.

The road course is also a popular motorbike racing spot, with the MotoGP usually visiting once a year, as well as several Japanese national bike racing series.