Traffic is slowed when it passes through the hamlet of Marlboro, but otherwise there is little change in US 9W until it widens to four lanes again just south of the Mid-Hudson Bridge approach overpass. At this point, US 44 and NY 55 join the highway from the east. The road becomes a busy commercial strip for the next mile to the concurrency's end, where NY 44 and NY 55 go down into Highland. The four lanes continue, however, for several more miles until well past the eastern terminus of NY 299, the road that carries traffic west toward the Thruway and New Paltz.