Police are investigating a collision in Wheelers Hill this afternoon.
It is understood a car and a motorcycle collided on the Monash Freeway, near the Wellington Road exit, at 12.47pm.
Officers have been told the rider was riding in tandem with another motorcycle at the time of the collision.
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The second rider was not injured and has since been arrested by police.
He is expected to be interviewed in relation to the incident.
The male rider was taken to hospital with life-threatening injuries.
The male driver of the vehicle stopped at the scene.
Major Collision Investigation Unit detectives attended the scene. An investigation remains ongoing.
Crime Stoppers 1800 333 000 or www.crimestoppers.vic.com.au.
