A 30-year-old man from Kirkby Underwood, near Bourne, is in hospital with fractures and a head injury after a road crash near Spalding.
It happened near Brantons Bridge, Pode Hole where a Ford Fiesta left the road at about 9pm on Saturday.
The man was initially taken to Pilgrim Hospital, Boston, before being transferred to Queen’s Medical Centre, Nottingham, where he is still in hospital.