A proposal to allow Pirelli more track time to develop its 2017 tyres this year has been approved by the Formula 1 Commission.
With significant changes planned, Pirelli wanted to ensure it had enough time and testing to prepare next year's new rubber.
Following a vote on Monday, the F1 Commission has approved Pirelli's proposal to test improvements for 2017.
As a result, the number of test days, which in the current regulations stands at 12, more than doubles to 25.
The change now requires ratification from the World Motor Sport Council, which is due on Wednesday.
As outlined by Autosport last Friday, it is understood the 2016 test plan comprises two phases.
The first will see the use of a pre-2015 car that will allow Pirelli to do conceptual work on current-sized tyres, but with a view to applying the '17 technology.
In late July or early August, Pirelli will then switch to a hybrid car, effectively a 2015 machine modified to the '17 aero package.
Five teams have agreed to supply a 2015 car for modification, understood to be Ferrari, Mercedes and Red Bull, and then two others from Williams, McLaren and Force India.
Following the agreement, it is believed Pirelli and the FIA are also now set to sign off on the contract from 2017-19, over six months after the Italian manufacturer was confirmed as continuing as supplier.