Police Scotland is renewing an appeal for information following a road crash on the A947 Dyce to Banff road in Aberdeenshire.
The incident happened just over one mile north of Oldmeldrum on the "Tullo Straight", about 7.25pm on Wednesday, 6 November.
The collision involved a grey Leximoto Michigan motorcycle and a silver Audi A3 and resulted in the 19 year old male motorcyclist sustaining serious but non-life threatening injuries.
The driver of the Audi was uninjured.
Sergeant Peter Henderson of the Road Policing Department said: "Our inquiries have established that a light coloured van stopped at the scene. We have not yet spoken to the occupant of this vehicle.
"If you were the driver or a passenger in this vehicle, or know who they are, I would urge you to contact on 101 quoting incident number 3657 of November 6.
"Anyone else with information who has not yet spoken to a police officer is also asked to get in touch."
Call 101 for non-emergencies and general policing matters, in an emergency call 999. If you have information about a crime you can also contact Crimestoppers anonymously on 0800 555 111.
If your email enquiry is relating to the UK or Scottish Governments coronavirus guidance please refer to gov.scot/coronavirus. If it is a medical enquiry regarding coronavirus please refer to nhsinform.scot/coronavirus.