It occurred on the A1079, Dunnington just after 6.30am, Tuesday 24 May and involved a Ford Focus and a green tipper wagon.
Traffic Constable Lee Cobb, of the force’s Roads Policing Group, said: “I am particularly keen to speak with the driver of silver lorry which was directly behind the green truck.
“I urge them to contact me straight away as I believe that they will have vital information about the collision.
“If anyone else witnessed the collision or can help to identify the driver I ask that they contact me as soon as possible.”
If you can assist with this investigation please contact TC Lee Cobb on 0845 60 60 24 7.