The FIA has confirmed the Halo cockpit protection device will be introduced in Formula One next year.
The Halo is designed to reduce the risk of serious head injuries in F1 by offering drivers extra frontal protection against flying debris.
The Shield device had also been in the running for 2018 but after an unsuccessful debut at Silverstone last Friday, the FIA confirmed that Halo "presents the best overall safety performance".
Initially, the FIA wanted to run Halo on all cars this year, but in July 2016 Formula One's Strategy Group voted to postpone its introduction to 2018 while more on-track tests were carried out.