New York State Route 51 (NY 51) is a 55.02-mile-long (88.55 km) north–south state highway in the central part of the U.S. state of New York. The highway runs generally in a southwest to northeast direction from NY 8 in the hamlet of Mount Upton to north of the village of Ilion, where it ends at NY 5. NY 51 intersects several primary routes including, a short overlap with NY 23 in the village of Morris, a 2.8-mile (4.5 km) overlap with U.S. Route 20 (US 20) in Winfield, and NY 5S in Illion. NY 51 is a two-lane highway its entire length.

New York State Route 8 (NY 8) is a 207.45-mile-long (333.86 km) north-south state highway in the central part of New York in the United States. It runs in a southwest-to-northeast direction from the Southern Tier to the northern part of Lake George. The southern terminus of the route is at an interchange with NY 17, where it begins concurrent with NY 10 in the town of Deposit. Its northern terminus is at a junction with NY 9N in the town of Hague. Roughly midway between the two endpoints, NY 8 passes through Utica, where it overlaps NY 5, NY 12, and Interstate 790 (I-790) along one segment of the North–South Arterial.