Route 100 in Millwood reopened after a crash briefly closed the busy intersection during rush hour Tuesday.
The incident occurred just before 6 p.m. near the ramp for the Taconic State Parkway in the town of New Castle.
Authorities on the scene tell News 12 that a driver jackknifed a UPS tractor-trailer.
The driver of the truck was checked out, and no one else was injured.