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School children wave checkered flags in front of the Pagoda building during a practice session at the Indianapolis Motor Speedway in Indianapolis, Indiana May 15, 2013. The 97th running of the Indianapolis 500 is scheduled for May 26. REUTERS/Brent Smith ( MOTOR-RACING-INDY )

Team Penske driver Will Power (12) of Australia leads Andretti Autosport driver James Hinchcliffe of Canada on the track during a practice session at the Indianapolis Motor Speedway in Indianapolis, Indiana May 15, 2013. The 97th running of the Indianapolis 500 is scheduled for May 26. REUTERS/Pat Cocciadiferro ( MOTOR-RACING-INDY )

Pippa Mann, of England, smiles after she drove during practice for the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Wednesday, May 15, 2013. (AP Photo/Michael Conroy) ( Indycar Indy 500 Pippa Returns Auto Racing )

Marco Andretti, left, talk with his grandfather and 1969 Indy 500 champion Mario Andretti during practice for the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Wednesday, May 15, 2013. (AP Photo/Darron Cummings) ( IndyCar Indy 500 Auto Racing )

Dale Coyne Racing driver Ana Beatriz (R) of Brazil climbs into her race car during a practice session at the Indianapolis Motor Speedway in Indianapolis, Indiana May 15, 2013. The 97th running of the Indianapolis 500 is scheduled for May 26. REUTERS/Brent Smith ( MOTOR-RACING-INDY )

A.J. Foyt Enterprises driver Takuma Sato of Japan drives his car on the track during a practice session at the Indianapolis Motor Speedway in Indianapolis, Indiana May 15, 2013. The 97th running of the Indianapolis 500 is scheduled for May 26. REUTERS/Pat Cocciadiferro ( MOTOR-RACING-INDY )

Marco Andretti autographs souvenirs for school children during practice for the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Wednesday, May 15, 2013. (AP Photo/Darron Cummings) ( IndyCar Indy 500 Auto Racing )

Ed Carpenter Racing driver Ed Carpenter of the U.S. drives his car on the track during a practice session at the Indianapolis Motor Speedway in Indianapolis, Indiana May 15, 2013. The 97th running of the Indianapolis 500 is scheduled for May 26. REUTERS/Pat Cocciadiferro ( MOTOR-RACING-INDY )

Dario Franchitti, of Scotland, prepares to drive during practice for the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Wednesday, May 15, 2013. (AP Photo/Michael Conroy) ( IndyCar Indy 500 Auto Racing )

Andretti Autosport driver Marco Andretti of the U.S. drives his car on the track during a practice session at the Indianapolis Motor Speedway in Indianapolis, Indiana May 15, 2013. The 97th running of the Indianapolis 500 is scheduled for May 26. REUTERS/Pat Cocciadiferro ( MOTOR-RACING-INDY )

An Indianapolis 500 flag hangs near a group of school children hoping for a driver's autographs during practice for the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Wednesday, May 15, 2013. (AP Photo/Darron Cummings) ( IndyCar Indy 500 Auto Racing )

AJ Allmendinger practices a pit stop with his crew during practice for the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Wednesday, May 15, 2013. (AP Photo/Darron Cummings) ( IndyCar Indy 500 Auto Racing )

The car driven by Sebastian Saavedra, of Colombia, is seen through a wheel as its pulled through the pit area during practice for the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Wednesday, May 15, 2013. (AP Photo/Darron Cummings) ( IndyCar Indy 500 Auto Racing )

Andretti Autosport driver E.J. Viso of Venezuela drives his car on the track during a practice session at the Indianapolis Motor Speedway in Indianapolis, Indiana May 15, 2013. The 97th running of the Indianapolis 500 is scheduled for May 26. REUTERS/Pat Cocciadiferro ( MOTOR-RACING-INDY )

Alex Tagliani, of Canada, waits for his crew to ready his car during practice for the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Wednesday, May 15, 2013. (AP Photo/Michael Conroy) ( IndyCar Indy 500 Auto Racing )

James Hinchcliffe, of Canada, pulls out of the pit area during practice for the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Wednesday, May 15, 2013. (AP Photo/Darron Cummings) ( IndyCar Indy 500 Auto Racing )

Takuma Sato, of Japan, prepares to drive during practice for the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Wednesday, May 15, 2013. (AP Photo/Michael Conroy) ( IndyCar Indy 500 Auto Racing )

Target Chip Ganassi Racing driver Scott Dixon of New Zealand drives his car on the track during a practice session at the Indianapolis Motor Speedway in Indianapolis, Indiana May 15, 2013. The 97th running of the Indianapolis 500 is scheduled for May 26. REUTERS/Pat Cocciadiferro ( MOTOR-RACING-INDY )

Tristan Vautier, of France, talks with his crew as he sits in his car during practice for the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Wednesday, May 15, 2013. (AP Photo/Michael Conroy) ( IndyCar Indy 500 Auto Racing )

Indianapolis Colts quarterback Andrew Luck watches cars on the track during practice for the Indianapolis 500 auto race, at Indianapolis Motor Speedway in Indianapolis, Wednesday, May 15, 2013. (AP Photo/Darron Cummings) ( IndyCar Indy 500 Auto Racing )