Madison, Illinois · US
An egg-shaped oval across the river from St. Louis, long known as Gateway, with distinctly mismatched ends.
World Wide Technology Raceway — still widely called Gateway — is asymmetric, with the two ends differing enough in shape and banking that drivers describe them as separate problems. It sits just across the Mississippi from St. Louis.
Both NASCAR and IndyCar race here, and the short lap combined with the mismatched corners makes traffic a constant consideration.