 Typically, reference routes are not signed; however, NY 990L is one of four such routes in New York that is at least partially signed.The East River Road stretch of NY 990L is the only section of the route that is signed; no other signs exist, including on NY 12 and NY 23 as reassurance markers.In 1948, the state of New York surveyed roads in the city of Norwich to determine which streets should be made state highways.