The following highways are numbered 31B:
New York State Route 31 (NY 31) is a state highway that extends for 208.74 miles (335.93 km) across western and central New York in the United States. The western terminus of the route is at an intersection with NY 104 in the city of Niagara Falls. Its eastern terminus is at a traffic circle with NY 26 in Vernon Center, a hamlet within the town of Vernon. Over its routing, NY 31 spans 10 counties and indirectly connects three major urban areas in Upstate New York: Buffalo–Niagara Falls, Rochester, and Syracuse. The route is one of the longest routes in New York State, paralleling two similarly lengthy routes, NY 104 to the north and NY 5 to the south, as well as the Erie Canal, as it proceeds east.
New York State Route 31B (NY 31B) was a state highway in central New York in the United States. It served as a connector between NY 31, its parent route, in the Cayuga County village of Weedsport and NY 5 in the Onondaga County town of Elbridge. NY 31B was assigned c. 1933, replacing New York State Route 293, a route assigned as part of the 1930 renumbering of state highways in New York. The NY 31B designation was removed in 1980 and replaced by County Route 31B (CR 31B) in Cayuga County and CR 99 in Onondaga County.
New York State Route 368 (NY 368) was a state highway in Onondaga County, New York, in the United States. It was one of the shortest routes in the county, extending for only 1.69 miles (2.72 km) between NY 321 and NY 5 in the town of Elbridge. NY 368 was known as Halfway Road for the hamlet it served near its midpoint. The route was assigned in the 1930s and removed in 1980 as part of a highway maintenance swap between the state of New York and Onondaga County.
