Barcelona and Red Bull Ring to host in-season F1 tests during 2015

Following a move last year to allow limited development mileage during the campaign, teams took part in four tests - after the Bahrain, Spanish, British, and Abu Dhabi Grands Prix.

However, with teams finding that the benefit of the tests did not justify the expense, it was agreed to cut back on running this year.

The FIA's 2015 Sporting Regulations, which were published on Thursday, confirmed that there will now be just two tests of two days - with teams having to run drivers with less than two F1 starts for two of the four days.

Teams have agreed that the tests will take place at Barcelona after the Spanish Grand Prix on May 10 and at the Red Bull Ring after the Austrian GP on June 21. The tests will take place on the Tuesday and Wednesday after the races.

F1's pre-season testing has already been reduced from four tests in 2014 to just three this year.

There will be one at Jerez (February 1-4) and two at Barcelona (February 19-22 and February 26-March 1).

For 2016 there will be a further restriction in testing, with just two pre-season tests taking place in Europe.