Many years ago before the AutoRoute was built, the French used to turn out in there hundreds to watch the British return home. Really pleasant experiences.
Indeed, before 2005 (when the stretch from Le Mans to around Elbeuf to the SW of Rouen was opened) it was a lovely drive and a fantastic sight along the old N138, with whole families out for the afternoon waving by the roadside and in the villages as we all headed home from the race.
It was a nice nod to history too, as the N138 was the route taken by the factory cars (e.g. Jaguar, Aston Martin etc) being driven to/from Le Mans in the 50s before race transporters came into vogue.
MG Mark