Talladega Superspeedway has the steepest banking in the turns. Turns 1 and 2 have 33 degrees of banking. Turn 3 is 32.4 degrees and turn 4 is 32.5 degrees.
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Probably, it would be Infineon because in turn 2, you have to go up a really steep slope to get to the top. And that (i think) is a lot steeper than the banking at Talladega.