In a bid to prevent cars being forced to retire from races because visor tear-offs were getting stuck in brake ducts, the FIA said in Australia it was going to enforce a regulation that forbid drivers from discarding them on track.
But following concerns from teams about the matter, the enforcement was delayed until Spain, and then put back again to this weekend.
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Source: Alonso says drivers may need 'X-rated' solutions for tear-off ban