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In page 2011 IZOD IndyCar World Championship:

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The pace car then led the cars back onto the track while every crew member and person behind the wall moved to the grass separating pit road from the track to watch.[8][9] The track loudspeakers blared renditions of "Danny Boy" and "Amazing Grace" played on bagpipes while the cars went around the track at pace lap speed, and each time the cars passed the start/finish line the fans remaining in the front-stretch grandstand offered applause. At the end of the five tribute laps, the starter waved two checkered flags to signify the end while the cars proceeded around the track one more time before exiting for the pits in turn four.[5][8]