There are 18 tracks that already hold races with one or two of the series. Take 12 to 14 of those tracks and it would make an unbelievable schedule for road racing fans.

Road America
Daytona
Indy
Laguna Seca
Road Atlanta
Watkins Glen
Lime Rock
Long Beach
Sebring
Montreal
Mosport
Belle Isle
Barber
New Jersey
Homestead
VIR
Mid-Ohio
Baltimore