Uber Eats and Deliveroo on Wednesday said they would impose afternoon breaks for food delivery cyclists in parts of France under severe heat warnings, in a measure not so far applicable despite high temperatures.

The measure was presented as a way to protect the health of the workers, but has been decried for depriving them of income.

France is experiencing its third episode of high temperatures since May, with men on bicycles this week cycling to bring meals to customers in heat as high as 40C in some parts of the country.

But nowhere on the mainland was under red alert -- the highest heat warning -- on Wednesday nor predicted to fall under that category on Thursday.

Both apps said they would halt access to users between 2:00 pm and 6:00 pm if there was such an alert.