Twin Ring Motegi

Mobility Resort Motegi (モビリティリゾートもてぎ) is a motorsport venue located in Motegi, Tochigi Prefecture, Japan. Originally Twin Ring Motegi (ツインリンクもてぎ), the venue's name came from the facility having two race tracks: a 2.493 km (1.549 mi) oval track and a 4.801 km (2.983 mi) road course. It was built in 1997 by Honda Motor Co., Ltd., as part of the company's effort to bring the Championship Auto Racing Teams series to Japan, helping to increase their knowledge of American open-wheel racing. The oval was last raced on in 2010 by the Indycar Series. On 1 March 2022, the name of the track was changed to Mobility Resort Motegi, coinciding with the 25th anniversary of the facility. The road course's most notable event is the Japanese motorcycle Grand Prix which is currently held every year. The track also currently hosts rounds in the domestic Super Formula Championship and Super GT series each year.

The oval course is the only one of its kind in Japan used for competitive racing. It is a low-banked, 1.549 mi (2.493 km) egg-shaped course, with turns three and four being much tighter than turns one and two. On March 28, 1998, CART held the inaugural Indy Japan 300 at Twin Ring Motegi Speedway. The race was won by Mexican driver Adrián Fernández. CART continued racing at Twin Ring Motegi Speedway from 1998–2002. In 2003, Honda entered the Indy Racing League and the race became a part of the IRL schedule. In addition to IndyCar racing, the track has also hosted a single NASCAR exhibition race in 1998.

Honda, which had built the oval for the express purpose of developing its oval-racing program for IndyCar racing, did not win a race at the track for its first six years of operation. In 2004, Dan Wheldon took the first win for Honda on the oval. In 2008, the Motegi oval gained additional publicity when Danica Patrick became the first woman to win an IndyCar race, beating Hélio Castroneves for her first and only IndyCar victory.

The 2011 season was the last season of IndyCar in Motegi. It had been dropped from the calendar as organizers looked to maximize viewing audiences. The road course, rather than the super speedway, was used for the 2011 race due to damage to the oval track resulting from the 2011 Tōhoku earthquake. The oval is not presently used for racing and even has been used as additional parking space during MotoGP events, but is still used for Honda's annual Thanks Day event showcasing various Honda road and racing vehicles, mainly from the nearby Honda Collection Hall, with Takuma Sato running a lap of the course in his 2017 Indianapolis 500 winning car seven years since the last IndyCar race in the oval.

The track length is disputed by series that run at Mobility Resort Motegi. The NASCAR timing and scoring use a length of 1.549 mi (2.493 km). This length was used by CART in their races between 1998 and 2002, too. The IRL measured in 2003 a length of 1.520 mi (2.446 km). This length was also used in the following races until 2010.

Mike Skinner won the only NASCAR Winston Cup Series exhibition race held at the track in 1998, the Coca-Cola 500. Skinner won driving the No.31 Chevrolet for Richard Childress Racing. The race was most noted for being the first oval track NASCAR race in Japan as well as being the first in which Dale Earnhardt and his son, Dale Earnhardt Jr., competed with one another, driving No.3 and No.1 Coca-Cola Chevrolets, respectively. The track also held the NASCAR West Series in 1999 with Kevin Richards getting the win.

The road course is 4.801 km (2.983 mi) 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; 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 built in a stop-start straight-hairpin style, which flows differently than many similarly-sized tracks. By Japanese standards the circuit is exceptionally flat, with only a slight elevation rise towards the hairpin turn. The road course is much busier than the oval track, with Super Formula 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 and FJ1600.