Rookies scheduled to participate are Matt Brabham, Max Chilton, Spencer Pigot, Alexander Rossi and Stefan Wilson. They must complete three phases of testing, with 10 laps in the range of 210-215 mph, 15 laps between 215-220 mph and 15 laps at 220-plus mph.
Veterans in the refresher program must complete the final two phases. Expected to participate are Townsend Bell, Bryan Clauson, JR Hildebrand, Sage Karam, Buddy Lazier, Oriol Servia and Alex Tagliani.
Practice continues daily through Friday, with qualifying scheduled for May 21-22.