SINGAPORE: The FIA has invoked its "heat hazard" regulation for the first time at a Formula 1 race because of the high temperatures forecast for this weekend's Singapore Grand Prix. The night race is also one of the steamiest on the Formula 1 circuit, with the combination of heat and humidity exposing drivers to perceived temperatures of up to 50 degrees Celsius in the cockpit. "Having received a forecast ... predicting that the Heat Index will be greater than 31 degrees Celsius at some time