Formula 1's bosses are heading into 2019 facing a critical period as they try to impose their vision on the sport.
Liberty Media's stewardship has produced mixed results since the US group took over in January 2017.
There is a more open atmosphere in F1, and a new race in Vietnam in 2020,but a number of historic events are under threat and teams' prize money has consistently dropped over the past 18 months.
Rule changes planned for 2021 have not yet been revealed, F1 has already lost one battle with the teams, and there is no agreement in other key areas.
And 2020, when all but one of the teams' contracts with F1 end, looms ever closer.