The Indystar has CART with a total of 20 drivers this year, the IRL with 30. I know that many CART venues have a contractual agreement that CART must provide a certain number of cars at their event. I would imagine that the recent adoption of the IRL specs is a hope to woo some of the IRL teams to CART events.
CART drivers
IRL drivers
CART drivers
IRL drivers
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