Police investigating the fatal collision on the A19 are seeking more information about the first collision that happened at the same spot about ten minutes before.
That crash took place on the southbound carriageway, about one mile from Thirsk at 8.45am on Saturday.
It involved a Silver Audi A4 which collided with a black Ford Focus.
PC Rosie Prior then stopped at the scene to help.
Shortly afterwards, Rosie, Ryan Welford and a young passenger from Ryan’s vehicle were tragically struck at the roadside by a heavy goods vehicle.
Sadly, both Rosie and Ryan were pronounced dead at the scene. The passenger remains in hospital in a serious but stable condition.
Officers from our Major Collision Investigation Team continue to appeal to any further witnesses, who have not yet come forward, who saw the first incident, or who have dashcam footage that could help their enquiries, to contact them.
DI Jill Cowling from the Major Collision investigation Team said: “Our thoughts remain with the families of Rosie and Ryan and we are doing all we can to support them at this incredibly difficult time.
“A thorough and complex investigation is underway and any information no matter how small is helpful. We are keen to hear from anyone who witnessed any part of this incident including those who may have only seen the initial collision involving the Focus and the Audi.
“If you saw what happened or have any information at all that could assist our enquiries, please get in touch.”
If you can help, please email [email protected] quoting reference number 12250006038.
The driver of the HGV, a 65-year-old man from Berwick-upon-Tweed, has been arrested on suspicion of causing death by dangerous driving. He has been released under investigation.