Red Bull is prepared to vote against the introduction of Halo next year if the decision is put through the normal rule-making process.
The FIA has been pushing for the introduction of the cockpit protection device next year, but following a test on Friday at the British Grand Prix Ferrari's Sebastian Vettel raised fresh concerns about visibility. Red Bull, which originally championed its own Aeroscreen solution to cockpit protection, also tested a Halo prototype on its car during in-season testing on Tuesday morning (pictured).
The FIA had hoped the final on-track and extrication tests over the last two weeks would lead to a decision by the end of July for its introduction next year, but Horner warned he would vote against it if it is put to the vote in F1's rule-making bodies.
"Personally I am not a big fan of the Halo," he said ahead of Red Bull's test on Tuesday. "I think it is inelegant solution to the problem that it is trying to deal with.
"I'd prefer there to be more research time taken to do the job properly, rather than rushing something through that may have other consequences. So, I am not a big fan of the halo and the limitations that it has." "I certainly wouldn't vote in favour of it at the moment."
Under FIA regulations, a vote against Halo by any of the teams this late in the season would act as a veto for its introduction next year. However, the FIA has the right to change regulations on safety grounds and therefore could force through the change if it sees fit.