Toto Wolff has defended the controversial banning of mid-season driver helmet livery changes. After the recent meeting of the F1 Commission, it emerged that the growing trend for multiple helmet colour changes will no longer be allowed. The rule has now been enshrined in to the 2015 regulations, which read that drivers must race "substantially the same livery" at every race, on the grounds that they can be "easily distinguished from one another". Sebastian Vettel, who has changed his colours no fewer than 60 times since debuting in F1, called the move a "joke". Indeed, the introduction of the rule has been widely controversial, but Mercedes team chief Wolff...
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