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The FIA has tightened radio restrictions ahead of Sunday's Hungarian Grand Prix.
Nico Rosberg was hit with a ten-second penalty after the British Grand Prix after Mercedes informed him how to deal with a gearbox issue in the latter stages of the race.
Article 27.1 of the Sporting Regulations states that drivers must drive the car 'alone and unaided' and Mercedes were deemed to be in breach of the rules.
Following on from the incident, the FIA has taken steps to tighten the radio restrictions and have warned that a message dealing with an issue with the car "must include an irreversible instruction to return to the pits to rectify the problem or to retire".
In addition, a team can only tell a driver about settings in the car if it is for the purpose of fixing a critical problem.
"Instructions to select driver defaults, this must be for the sole purpose of mitigating loss of function of a sensor, actuator or controller whose degradation or failure was not detected and handled by the onboard software," the FIA said.
"It will be the responsibility of any team giving any such instruction to satisfy the FIA technical delegate that this was the case and that any new setting chosen in this way did not enhance the performance of the car beyond that prior to the loss of function (see Article 8.2.4 of the Technical Regulations)."