Just a heads up to anyone planning to travel along what was the the free N79 road along the section between Sazaret and Digoin. We use the route each winter en route to the Alps for skiing and the road has been in the process of being "dualled" for quite some years now with no sign that it was going to become an autoroute. However, this year we joined at an intermediate point along the way with no obvious sign that it had become a "peage" section ie no toll booths or other warnings. Luckily, along the way I spotted signs mentioning "autoroute Flux Libre" and giving a web address for information and payment but it would have been easy to miss the signs, especially for non French speakers, which would result in a hefty fine. Once we had parked up I visited the website and made the payment and on the return journey we were able to call into a service area and pay at a machine there. Anyone with a toll tag would not have to worry as they will be automatically charged but everyone else needs to take care, especially if these Flux Libre sections catch on in other parts of France. Anyway, here is a link to the website for anyone interested https://www.aliae.com/en/home.html