IndyCar will require all cars attempting to qualify for the Indianapolis 500 to use race trim and normal boost levels Sunday after another frightening crash in practice. The moves come after Ed Carpenter's car hit the wall in the second turn, turned backward and flipped over. It's the third time this week a car has been unable to keep all four wheels on the track's 2.5-mile asphalt surface after getting turned around. ''When we're talking about an event here, we're talking about safety,'' said Derrick Walker, the series' president of competition and operations.
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