The speed limit on départemental highways in France is 80 km/hr. Some départements have moved to increase the speed for this class of road back to 90 km/hr, where it was until about 2018, when Prime Minister Edouard Philippe lowered it in a bid to reduce accidents and save lives.
The département of Calvados, which contains Caen, Bayeux, Lisieux, Honfleur, Vire, and Ouistreham, was one of those départements raising the speed limit in 2023, unlike neighboring Manche, where the limit stayed at 80.
A little over a week ago the Caen Administrative Court determined that there were procedural deficiencies in making the change, and that the change to 90 in Calvados must be overturned. Consequently, many départemental highways in Calvados that currently have a speed limit of 90 km/hr will revert to 80 km/hr on 15 June 2026. The articles I've seen on the topic say "certaines routes" are affected, so it seems that, perhaps, not all départemental highways in Calvados will revert to 80 km/hr.
The article I saw in La Manche Libre is behind a paywall but there's one on franceinfo that one can read without a subscription.