IndyCar's 2015 testing regulations include no in-season on-track team activity but the re-introduction of Open Tests before selected races.

The rules, revealed after the Sonoma weekend, also make provision for potential Firestone tyre tests, as well as extra opportunities for new Verizon IndyCar Series teams and first-year drivers. The regulations apply from 31 August this year through to 20 September 2015.

A team is permitted a total of 14 test days, comprised of engine manufacturer tests, team tests, Open Tests and full-size wind tunnel tests. Full-season entrants are allocated a maximum of 10,000 total miles for use in all on-track activity from the first race or Open Test of 2015 to the end of the race season.

"The reason for changing the testing regulations is about trying to contain the costs and fit into our new schedule," president of competition Derrick Walker explained, "Competition drives teams to test as much as they can because they're trying to win races, but combined with the schedule it's hard on the team members.

"Now we're making provisions for race events to have promoter day tests, where the cars will be on the track and hopefully the promoter sees that as an opportunity to open up the stands for fans and sell race tickets."

The first Open Test is scheduled for Barber Motorsports Park over 16-17 March next year, and will be the initial opportunity for teams to test manufacturer road and street course aero kits to debut at the Firestone Grand Prix of St Petersburg over the weekend of 27-29 March.

Other Open Test venues include the Indianapolis Motor Speedway road course, Mid-Ohio Sports Car Course and Sonoma Raceway.

"Barber has a lot of fast, sweeping corners - areas where you'll really see the aero kits perform," Walker continued, "The teams already have data and familiarity with Barber and Firestone has great tyres for that circuit. The teams can compare and relate to what they've done in the past while getting a handle on the aero kit."

The 2014-15 off-season track testing period opens on 16 September, and six days of manufacturer aero kit testing will be conducted, with selected teams, between 6 October and 18 January before teams take delivery of the road and street course aero kit at the start of March.