Montréal and Québec City are linked by Autoroute 20 on the south shore of the St. Lawrence River and by Autoroute 40 on the north shore. On both highways, the ride between the two cities is about 240 km (150 miles) and takes about three hours. U.S. I–87 in New York, U.S. I–89 in Vermont, and U.S. I–91 in New Hampshire connect with Autoroute 20, as does Highway 401 from Toronto. Driving northeast out of Montréal on Autoroute 20, follow signs for Pont Pierre-Laporte (Pierre Laporte Bridge) as you approach Québec City. After you've crossed the bridge, take the exit to boulevard Laurier (Route 175), which becomes the Grande-Allée.