Available in 360, 580 and 910mm.
The original squared-oval Indianapolis Motor Speedway was built in Indiana in 1909 and has been through many revisions over the years. The original rectangular oval is 2.5 mi long.
Interestingly the speedway was envisioned by Carl G. Fisher in 1905. After a trip to Europe, helping friends racing in France, he realised the US needed a better method of testing cars if they were to compete with Europe and their craftmanship.