Something I noticed after several viewings (possible spoilers)
I knew TFR followed a non-chronological narration. Recently, I realized the plotline's order is in fact geographical, and very coherent in this aspect. The film begins with Joanna and Mark arriving to the airport, and the flashbacks are provoked by the sight of the ferryboat (first trip) and the french waterfront and customs (third trip with the MG). From then on, the heroes, at different stages of their lives, follow the same road through the countryside, heading for the South. For instance, the Chantilly hotel brings back memories of the carefree, eventful MG trip, confronted to a comfortable but dull present. The second trip, with the annoying couple and their daughter is interrupted near the middle of the movie and thus the storyline disappears; while the fourth trip with Caroline was clearly made by plane and not all the way through the country, and is presented mid-movie.
As the film advances, Joanna and Mark are getting closer and closer to the South. They go to the beach (first, third and last trip), visit Maurice's villa (third and last trip) and we see that although the scenery changes, the places are the same through the years: the deserted, idyllic beach of their youth becomes invaded with building works, then some time later with tourists and fancy restaurants.
At the very end, which covers only the last trip, the couple reaches the closest point to the South, as they cross the Italian border, heading to Rome. I loved the movie not paying much attention to the narratives' logic but it does make sense to me now that all these non-sequential flasbacks are in fact Joanna and Mark's reminicenses provoked by the landscapes and places that they saw at different points of their lives, and which make them recall the past, and compare it with nostalgy and bitterness to the present. It also makes the title even more revelant than I thought: Joanna and Mark are indeed on the road, a real road to the French Provence and a symbolic road through love and marriage.
The ending sequence is very poignant in that aspect. The customs agents allow them to go through the Italian border, and it seems like on another level, they are allowed to go on with their life together, to travel further away. Like their trip, their life together is not ended, for a while, anyway.
" You ain't running this place, Bert, WILLIAMS is!" Sgt Harris