IndyCar has confirmed details of the race two qualifying procedure for the three double-header events on the 2013 schedule.
Qualifying for the second races in Detroit, Toronto and Houston will be split across two groups, with each getting 12 minutes and a minimum of five minutes of track time. The arrangement required a change to Rule 184.108.40.206, which had originally specified a 30-minute session involving the entire field.
Groups will be determined by practice times from the previous day, with Group 1 being reserved for odd-numbered positions and Group 2 being allocated to even-numbered positions. Times from the two groups will be combined to determine the starting order.
"Splitting qualifications for the second race will give a premium to the amount of track time available to each competitor," said IndyCar race director Beaux Barfield. "It will improve the ability for competitors to get a clean lap and post a true lap time."
The grid for the first race will follow the standard three-round format used at other road and street course events.