SINGAPORE (AP) — This week’s Singapore Grand Prix has been declared a “heat hazard,” meaning cars must carry cooling equipment though drivers don’t have to use it. It’s the first time the rule has been used in Formula 1 .

Race director Rui Marques made the decision on Thursday because the temperature is forecast to be above 31 degrees (88 F) during the race weekend.

The temperature in the F1 website forecast for Saturday is 32 C, rising to 33 C on Sunday. Inside the car, it can get much hotter.

Under new rules for 2025, governing body the FIA introduced cooling vests for drivers which pump fluid around a network of tubes in the vest.

“It’s good, and when you’re racing in 90% humidity and cockpits are getting on for 60 degrees (Celsius), it’s a bit of a sauna inside the car,” said Mer

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