As reported by Motorsport.com earlier today, F1 race director Charlie Whiting had vowed to issue a clampdown on the matter following heated discussion in Friday night's drivers' briefing.

The matter had come up following unease by several drivers about the common tactic being used by Max Verstappen – which was highlighted again on the penultimate lap in Japan as he battled Lewis Hamilton.

In revised event notes sent to teams ahead of qualifying for the United States Grand Prix, Whiting made it clear that he would view moving under braking as a breach of regulations.

The note said: "Article 27.5 of the Sporting Regulations states that '...no car may be driven...in a manner which could be potentially dangerous to other drivers...', furthermore, Article 27.8 prohibits any manoeuvre '...liable to hinder other drivers, such as...any abnormal change of direction'.

"With this in mind, and with the exception of any move permitted by Article 27.6, any change of direction under braking which results in another driver having to take evasive action will be considered abnormal and hence potentially dangerous to other drivers. Any such move will be reported to the stewards."

In the event of a breach of rules, stewards would have the right to impose a penalty of their choice, which could be a time penalty or even full-on disqualification.