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Formula 1 teams will not be allowed to issue coded messages to drivers as a way of getting around the clampdown on team radio instructions.

The FIA has told teams that from the Singapore Grand Prix any communication that helps the driver or car performance is banned.

The rule change has been implemented through a strict enforcement of Article 20.1 of F1's Sporting Regulations that states drivers must drive their cars 'alone and unaided'.

Analysis: Impact of team radio limits

Ahead of talks with teams on the eve of the Singapore race to further clarify the matter, the FIA has made it clear that there will be strict enforcement of the rules at all times of the race weekend - not just the grand prix itself.

And they will be told that using coded instructions to drivers to change settings such as differentials, brake bias or engine mapping will not be tolerated.

When asked about the possibility of teams being allowed to use secret codes or different language, an FIA spokesman said: "No, definitely not, this is exactly what we feel infringes Article 20.1."

Although there will be 22 drivers to listen in on, the FIA has made it clear that every conversation will be monitored and recorded to ensure that there are no rules breaches.

If there are instructions given to drivers, then a report will be sent to the race stewards, with the potential for stop-go penalties or other sporting sanctions.

"It will be up to the stewards of course [about a penalty], but it is probable that it would be a sporting penalty rather than a monetary one," the FIA added.

There will also be a 'zero tolerance' approach to the matter, with the FIA stating that there should be no reason for teams to be given just a slap on the wrist if there is a breach.

"Provided we are able to lay down clear guidelines, we see no reason for warnings," added the FIA.

EXAMPLES OF WHAT IS AND WHAT IS NOT ALLOWED

Allowed

- Telling a driver when he is allowed to or meant to stop for new tyres

- Team orders in terms of overtaking or letting a team-mate past

- Warning a driver about the traffic situation during qualifying and the race

- Safety warning relating to yellow flags or dangerous situations on the track

Not allowed

- Informing a driver to change any settings on his car to improve its performance

- Informing a driver about his fuel consumption and how to manage his pace

- Informing a driver about his own performance in sectors and where he can improve

- Informing a driver about the condition or state of his tyres

- Informing a driver how best to approach the formation lap or setting changes to make better start