High Quality Content by WIKIPEDIA articles! Autoroute 25 (or A-25, also called Autoroute Louis-H-Lafontaine in Montreal) is an Autoroute in the Lanaudière region of Quebec. It is currently 49 km (30.4 mi) long, with a short gap which follows arterial roads in the north end of Montreal. A-25 begins at an interchange with Autoroute 20 and Route 132 in Longueuil and quickly enters the Louis Hippolyte Lafontaine Tunnel into the east end of Montreal. It is the main north-south freeway in the east end of Montreal (actually northwest-southeast but perpendicular to the St. Lawrence River).