 Within a mile of the county line it passes under the New York State Thruway Berkshire Connector and meets the lone section of I-90 in New York not part of the Thruway system, at exit 12 southeast of Castleton-on-Hudson.north of I-90 and northwest of Nassau, US 9 veers left to merge with US 20 in Schodack Center, and together they progress northwest toward Albany.Less than from the eastern terminus of the overlap, US 9 and US 20 intersect NY 150 before connecting to I-90 at exit 11.