The collision was reported at 4.30pm today (Friday 30 September) and involved a lorry and a pedestrian.
The injured man, who is in his seventies, has been taken to hospital with serious leg injuries.
The road has been closed while collision investigators examine the scene.
Any witnesses to the collision are asked to contact North Yorkshire Police on 0845 60 60 247 quoting reference 0388 of 30 September.
If you have details of this incident and would like the Police to make contact with you, then please complete the following contact form: