The Rocade de Rennes (official Route Nationale number 136) is the ring road around Rennes, France. It's introduced to Euro Truck Simulator 2 through the Vive la France! map expansion.
All in-game road signs directing to / through this road show a double-ring icon instead of the actual road number. This practice is consistent with the real-life Rocade.
Because of the rendering scale, the in-game road is much longer than the real-life road – specifically, the real-life road is only 31 km long, but the in-game road spans a distance of 200 km, 6.5 times as long as the real-life road.