Route 185 is part of the Trans-Canada Highway. It travels from Saint-Antonin to Saint-Louis-du-Ha! Ha!, a distance of about 41 km (25.5 mi). It connects the 2 sections of Autoroute 85 and is the former designation for all of A-85. The southern section of the highway follows the valley of the Madawaska River. Route 185 has been or is being made 4 lanes through most towns along its route.