The A151 near Spalding has been closed in both directions following a crash involving a motorbike and a truck.
The crash happened at around 6am on Friday, June 2 on High Road at the B1357 Bell Lane Junction in Moulton.
The motorcyclist has been airlifted to Queen’s Medical Centre in Nottingham.
It is unknown at this stage how serious the biker’s injuries area.
Emergency services are currently on the scene and the road has closed in both directions while it is cleared.
Police are dealing with this under incident number 70 of June 2.