There should be a mix of ovals, including at least one, proper, intermediate oval.
I'm just going to say this now; Salem is too short with too much banking for these cars. It's too fast in too confined a space, so when somebody has a serious wiggle, the risk is too great of piling up a good part of the field.
At Lime Rock, there is the fencing issue, and limited run-off in a number of places. Also, IndyCar doesn't have a history of racing there, and FIA regs probably would require open-wheelers of this spec to run on a permanent road course of no less than 3.0km to the lap.
They'd probably decide that they had to run the West Bend Chicane too, which would likely hose up quite a bit of the circuit's actual racing potential. It's kind of amusing, but part of the reason the ALMS went back to the old West Bend is that the chicane made the Diving Turn flat-out, and so the exit speed there, in fact, became faster than without the chicane.
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