IndyCar has finalised the heat-race qualifying format it will use for its event at Iowa Speedway on 23 June.
As revealed by AUTOSPORT in February, the series announced that three heat races of 30 laps each would replace single-car qualifications on the 0.875-mile oval.
The top eight fastest cars in combined practice will compete in the third and final heat race, which will determine the top eight starting positions for the race.
The other two heat races will be divided between even and odd-numbered finishers in practice, and will in turn determine the two sides of the grid: heat one deciding the grid from 10-12-14 down, and heat two from ninth to 11th, 13th and down.
IndyCar's president of competition Beaux Barfield said the qualifying procedure was aimed at emulating the excitement of the three qualifying rounds on street courses, which culminate in the Firestone Fast Six.
"The build-up we presently have for the Firestone Fast Six has that excitement and we wanted to do something similar for the oval events," Barfield said. "It's going back to the heritage of short-track races."