I get the idea that they are rest stops on autoroutes and other kinds of highways. One of the best small chains here for patates frites here is the supposedly Belgian "Frite alors!" They do have good frites though - more the exception than the rule here in Montréal.
As for me, I cooked some rattes - very tasty potatoes. I prepared some pieces of lamb's liver with red onions and other things. it isn't quite suppertime here. en.wikipedia.org/wiki/Ratte_potato The rattes were a little present - no, I don't mean lady rats
I microwave small potatoes frequently throughout the summer.
After I microwave them, I let them cool off, cut them in half and then put them in a either tinfoil or a tin pan, sprinkle with olive oil and add a few spoonfuls of butter, salt and pepper and let them roast on the BBQ or on cool days, in the oven. I find them crunchy on the outside and fluffy inside. Sometimes I toss them along with green beans in a dill cream salad dressing.