Les routiers were at one time the roadside truck stop restaurants, located all around France; they may still exist, but since I haven't been a truck driver in France (unless maybe in a previous life), I can't confirm. But what I can guess is that just as the classic diners of America have gone by the wayside, the routiers have been slowly disappearing as well.
However, all is not lost, as a number of restaurants literally with the imprimatur of Les Routiers, are catering to Parisians who miss them...or perhaps what they stood for. At least 3 are open and thriving in the city of lights.
We like the one in the 11th, walking distance from where we stay. I have a hunch @Steve R. may have eaten here as well.
Our 2nd trip to Aux Bons Crus, because we liked it last time, though last time was quite some time ago. The food may not be the most photogenic, but it's delicious.
Oeufs.
Stuffed cabbage. Oh - Chou Farci, if you insist.
Mine!
With (I think) one of @Margaret Pilgrim's favorites:
An Alsatian Riesling to drink with that choucroute. Recommended. And budget friendly.