Facilities on the Rennes-Morlaix road (a motorway, rather than an autoroute) have improved and, just maybe 10-15 ks out of Rennes, we stopped at a place called Aire D'Amour et D'Argoat. Shell have the petrol concession here and this is as good as any aire you'll find on the autoroutes. It also has a Wi-Fi corner plus tourist info counter.
Didn't see anything like this again but there are a few more basic stops along the way over to Morlaix. Also, as this is a motorway (not an autoroute), you'll have plenty of opportunities to pull off and fill your petrol tank in one of the nearby villages. But thus could be time-consuming, especially if your time to make the ferry is diminishing. read more