The prohibition was implemented in the World Endurance Championship last year but lifted for the French classic after a chilly Spa-Francorchamps round was the scene of several crashes on cold tyres, including Toyota's Brendon Hartley at Raidillon in qualifying and Ferrari's Antonio Fuoco mere seconds after leaving the pits in the race.
Although another U-turn was considered for 2024, the ban remains in place this week at Circuit de la Sarthe, where temperatures are not be particularly warm to make up for it – they are in line with the 1991-2020 weather data, dipping close to 10°C (50°F) at night.
