Five people have been seriously injured in a collision on the B1391 junction with the A52 near Boston.
Lincolnshire Police said five people from within the car have been seriously injured.
“This happened just after 6.30am and we are looking to speak with the driver of a white or light coloured Transit van who we believe may have witnessed what happened.
“This vehicle had the numbers ‘07’ on its back door and was not involved in the collision.”
Road closures and diversions are in place.
To report, people should call 101 quoting incident 29 of November 7.