The FIA has agreed to delay the introduction of a rule that will force cars to run under electrical power only in the pitlane from the start of 2014, AUTOSPORT can reveal.
The requirement was aimed at showcasing the use of electric power in F1 as the sport shifts to more environmentally friendly technology.
Article 5.19 of the 2014 Technical Regulations states: "The car must be run in electric mode (no ignition and no fuel supply to the engine) at all times when being driven in the pitlane."
However, sources have revealed that engine manufacturers Mercedes, Renault and Ferrari all wrote to the governing body recently to ask for the rule to be postponed.
It is understood that they were concerned about both the costs of developing bespoke electrical systems just for use in the pitlane, as well as safety concerns about having fast cars rushing through a pit lane without a loud engine noise to warn working personnel of their presence.
FIA president Jean Todt has confirmed that he has agreed to delay the implementation of that electric mode requirement, with a change to the rules expected to be ratified at the next meeting of the FIA World Motor Sport Council later this year.
Speaking to AUTOSPORT, Todt said: "I have accepted to delay it. It has to go through the World Council, but it will be delayed for around three years."