The incident happened shortly after 2pm close to the Pineberry Inn.
Reader Andrew Lambert posted two of these pictures on Twitter and said: "Nine vehicle pile up between Thornton and Queensbury near Pineberry Pub...blizzard conditions. No way through."
Later reports confirmed there were 11 vehicles involved.
Mr Lambert said: "Lots of emergency services here. Drivers and passengers involved sheltering on a double decker bus.
"At least one stretcher used but all [incidents] seem to be slow-speed minor bumps."
A police spokesman confirmed 11 vehicles had been involved but said there had been only one man with injuries which needed hospital treatment.
A snow plough and gritters have now been called in to help make the scene safe.
The road was closed in both directions to allow the vehicles to be recovered. It was re-opened at about 4pm.