This article is from the Motorsport FAQ, by A H Henry bspahh@midge.bath.ac.uk with numerous contributions by others.
Qualifying at the Speedway is unique. The fastest 33 cars from the
the four days set aside for qualifying start the race. The actual
starting order depends on the day that the qualifying time was set.
This means that the fastest cars do not necessarily start from the
front of the grid.
The Speedway opens for practice on the first Saturday of May.
Practice is daily from the opening day to the last day of qualifying.
The track is open for practice starting at 11:00am (EST) and finishes
at 6:00pm (EST) or at the discretion of the USAC officials. The first
two days of qualifying are scheduled for the weekend two weeks before
the race. The second two days of qualifying are scheduled for the
week before the race. These days are called the `Time Trials'. There
is one last day of practice held on the Thursday before the race
called Carburetion Day. In the old days, this was the last day of
practice where the mechanics would adjust their cars carburetors.
Carburetion Day sounds better than Fuel Injection Day, don't it ?
 
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