 Just across the county line , I @-@ 87 intersects NY 9N again at exit 34 , the southernmost junction to feature bilingual guide signs in English and French due to the road 's proximity to Quebec . Past NY 9N , the Northway curves to the north , running along the west side of Keeseville before entering another rural but fairly level stretch that follows I @-@ 87 out of Adirondack Park . Now outside the park , the highway encounters more frequent pockets of development as it follows NY 22 into the town of Plattsburgh . Just inside the town line , the Northway crosses over the Salmon River and intersects NY 22 at exit 36 , a junction serving nearby Plattsburgh International Airport . While NY 22 heads northeast into the city of Plattsburgh , I @-@ 87 runs north through its western suburbs , passing over the Saranac River and intersecting NY 3 at exit 37 . The Northway and NY 22 meet again north of downtown at exit 38 . 
