French farmers in tractors and trucks expanded their roadblocks on Tuesday, resulting in numerous traffic jams as well as one fatal accident, as unions urged the government to address their demands for lower costs and regulation, Ednews reports citing Reuters.

"We won't lift the roadblocks as long as the prime minister does not make very concrete announcements ... The time of talking is over, action is needed", said Arnaud Gaillot, head of the Jeunes Agriculteurs (Young Farmers) union.

The growing outrage, which has spilled over from neighbouring countries, comes as campaigning for EU elections gains pace, and is the first major challenge for President Emmanuel Macron's new prime minister, Gabriel Attal.

Hours after union officials met Attal on Monday evening, new convoys of tractors set out in the night to block roads, including the A7 motorway in southern France.

"Fed up with environment taxes" read a slogan sprayed in pink on a slurry tank blocking the highway in a picture published by French media.

Police said one woman was killed and two others were heavily injured as a car ran into a roadblock in the southwestern Ariege region.

"In this moment of high tension, I call on everyone to stay calm and reasonable," Arnaud Rousseau, head of the FNSEA farmers' union, told RMC radio.

French farmers are also protesting against price pressure from retailers determined to bring down food inflation, and against tightening environmental regulation - grievances that have triggered protests across Europe.

"We're prepared for anything, we've got nothing to lose," said Josep Perez, a protester interviewed by BFM TV at a roadblock in the southwestern fruit-growing region around Agen, where traffic on the A62 motorway had been disrupted since Monday.

Protesters in Agen's city centre were shown throwing kiwi fruit at the local prefect's office in footage posted on social media.

Macron is wary of farmers' growing support for the far right ahead of the European Parliament elections in June.