A motorcyclist suffered serious head injuries in an accident in Holbeach on Saturday.
Emergency services were called to Hazelwood Lane at about 5.20pm after a 48-year-old Fleet man came off his BMW F800 motorbike.
He was flown to the Queens Medical Centre in Nottingham, where he remains in a critical condition.
Anyone who witnessed the collision, or who saw the bike prior to the incident, is asked to contact Lincolnshire Police on 101, quoting incident 355 of September 7.