David Steel, 50, of Ford Estate, Sunderland, died on Sunday, July 28 as a result of serious injuries sustained in a two-vehicle crash.
Mr Steel was taken to hospital by the emergency services after suffering serious injuries to his lung, ribs and neck in the collision, which also involved a car.
Sergeant Dave Roberts, of Northumbria Police’s motor patrols department, said: “This is a tragic incident that has led to David’s death, and our thoughts go out to his family and friends as they come to terms with this devastating news.
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“An investigation is ongoing to determine the circumstances surrounding David’s death, and we will continue to carry out inquiries this week to form a chronology of events.
“A number of witnesses have already come forward and passed on information to officers, and I would like to thank those who have called in for assisting with our investigation.
“I would now like to make a fresh appeal for any other witnesses who are yet to come forward to do so.
“In particular, our inquiries have led us to identify a black saloon-style vehicle which was in the vicinity at the time of the collision.
“That driver may have valuable information that can hold the key to this investigation, and I would ask them to come forward and contact police at their earliest opportunity.”
Contact Northumbria Police on 101 quoting reference 921 240719.