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Source: South Australia Police

Police are at the scene of a serious crash involving a motorbike.

About 9.15pm on Wednesday 18 November, police and emergency services were called to Morphett Road at Morphettville after reports a motorbike left the road out of control and collided with a street sign.

The solo motorbike rider was taken by SAAS to the Flinders Medical Centre in a critical condition.

Morphett Road has been closed for north bound traffic between Oaklands Road and Harding Street.

Anyone who witnessed the crash is asked to contact Crime Stoppers on 1800 333 000.