Detectives have named a man and woman who died following a motorcycle crash on the A1 Western Bypass near Swalwell on Friday night.
They are Matthew David Lee aged 21, from Ingleby Barwick in Stockton on Tees, and his girlfriend Marie Brown aged 19, from Middlesbrough.
Their families have been informed.
Sergeant Steve Templeman of the Road Safety Unit said: "We are still trying to piece together the events leading up to the collision and we need to speak to anyone who saw the red Triumph motorcycle travelling south from the direction of Denton Burn, in the moments leading up to the collision."
Police are continuing to appeal for anyone who witnessed the collision or saw the motorcycle before the collision to contact them.