Police are appealing for witnesses and dashcam footage of an incident on the A64.
A white Mercedes Sprinter van collided with a grey Vauxhall car on the A64 eastbound, just after the Hopgrove roundabout, and the drivers had an altercation by the roadside.
Shortly after that, the van collided with a man in his 50s who was on the carriageway, who had been driving the car.
He suffered serious injuries and remains in hospital for treatment.
The incidents happened last Saturday (26 March) at around 1pm to 1.10pm.
Police are requesting the help of anyone who has any dashcam footage of the incident itself or the driving before-hand of either vehicle, and for any witnesses who have not yet been spoken to by police to come forward with any information.
Please contact North Yorkshire Police on 101, select option 1 and quote reference 12220051326.