The Castleblayney to Lough Egish road is closed to clear an overturned lorry.
The single-vehicle incident occured this afternoon on the R181, near Tullynahinera.
The driver of the truck was safely removed by members of Castleblayney fire brigade.
Gardaí remain at the scene and diversions are in place while they await a crane to clear the scene.
The road is expected to be closed for a number of hours.