Several news outlets in France today are reporting that, after months of controversy, the law lowering speed limits on certain French roadways was published in le Journal Officiel last night, which means it officially will take effect on the first of July. (text of the new law, as published: https://www.legifrance.gouv.fr/affichTexte.do;jsessionid=ED5A9BDCE9FDE96474FD891B24A4F939.tplgfr31s_2?cidTexte=JORFTEXT000037076517&dateTexte=&oldAction=rechJO&categorieLien=id&idJO=JORFCONT000037076512)
The law, which is intended to reduce traffic fatalities, applies to secondary roads that have one lane each traveling in opposite directions with no separation or physical barrier between the lanes of opposing traffic. Beginning on 1 July of this year, the speed on these types of roads, which up to that time would have been 90 km/hr (56 mph) unless otherwise posted, will decrease to 80 km/h (50 mph).
It's a safe bet that most fixed GPS systems in cars will be out of date and will still show the out of date limit of 90 km/h, so drivers should pay attention to signs and to the type of road on which they're traveling or risk getting a letter after you return home asking for a mandatory contribution to your local French law enforcement authority.
Reportedly, most motorists and motorcyclists in France hate the new law. Speeding, no doubt, will be rampant in areas without speed radar (locals generally know where these areas are; travelers generally don't). Tailgating is all but assured for anyone having the temerity to actually follow the speed limit.
Should be interesting.