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The incident involving a black Triumph Daytona motorcycle and a Volvo 850 occurred on James Lane at around 5pm on Thursday 7 April 2011.
The driver of the Volvo, a 59-year-old man from Catterick Village, suffered burns in the incident and was taken to Royal Victoria Infirmary, in Newcastle, where he remains in a stable condition.
The rider of the motorcycle, a 41-year-old man from Skelton in Cleveland, was also seriously injured in the collision and is currently in James Cook Hospital in a stable condition.
Any witnesses to the collision are urged to contact Traffic Constable Graham Waller, of Richmond Road Policing Group, on 0845 60 60 24 7.