Police and fire crews are on the scene of a crash on the A15 just past the Digby turning, near Sleaford.
A vehicle ended up in a ditch after the crash at Dunsby Hollow, Cranwell.
An air ambulance has been deployed to the area and the road is blocked in both directions.
The road will be closed while the vehicle is recovered, which is expected to take around 45 minutes.
There are significant traffic delays in the area.
An eyewitness told The Lincolnite that they saw one vehicle on its roof.
Lincolnshire Police confirm just one vehicle was involved.
Injuries are not believe to be life-threatening.