Milford Superspeedway 1.0

It says 2 turns, but it really has 4.

Dubai Autodrome
One of the premier racing venues in the Middle East.
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High Plains Raceway
Colorado's amateur racing circuit that also hosts a 24 Hours of LeMons race.
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Infield Test Track
A very demanding test circuit that requires the utmost attention.
Motegi Full Fantasy Circuit
The combination of the oval and road courses.
Special Stage Route 11 (GT3)
It's a couple hundred meters short, but otherwise it is very accurate.