A man of 25 suffered serious head and chest injuries when his car was involved in a crash with a JCB tractor on Tuesday morning.
The man, from Kirton, was taken to Boston’s Pilgrim Hospital.
Police say his injuries are not life threatening.
The accident happened at the A16 junction with Gosberton Bank shortly after 5am and the road was closed until 7.20am.
Police have asked witnesses to contact their collision investigation hotline on 01522 558855.