Highway 17 is closed in both directions east of Dryden,
OPP say the closure is due to a collision about 20 kilometres west of Dryden by Egli’s Sheep Farm.
Highway 594 can be used as a detour but that route is only recommended for passenger vehicles.
The crash was reported around 11:30 and no other details have been released.
Reports say the collision involved three transports.
There is no indication when the highway will reopen.
