Adrian Newey, who is frustrated with F1's new regulations, fears the sport could face "grave danger" unless there's a "rethink" about the rules.
Although last weekend in Montreal, Red Bull Racing signed Newey onto a new "multi-year" contract, the technical chief won't be spending much time focusing on F1 in 2015.
Instead the Brit will be concentrating on outside projects, admitting he has grown disillusioned with Formula 1's "very restrictive" regulations.
Some of the rules that he is unhappy with relate to the new 1.6-litre turbocharged V6 engines and the ERS package.
This has been Red Bull's downfall this season as the team's engine supplier...
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