F1 heat hazard declared for fourth time this season
The Singapore Grand Prix is declared a heat-hazard race, the second weekend in a row that the designation has been used in Formula 1.
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A cooling kit is not mandatory, but any driver who chooses not to use it has to carry 5kg of ballast in their car to ensure he does not have a competitive advantage.
The system uses a cooling tank and pump, usually situated in the car's nose, that delivers a cooled liquid, such as glycol, through a system of pipes in a fireproof top worn under their overalls.
