A cyclist is in a critical condition after a collision with a car at Mount Colah in Sydney’s north.

The man, aged in his 40s, had been riding on Ku-ring-gai Chase Road when he was hit by a station wagon.

His body fell through the windscreen on impact.

The man was treated by bystanders before paramedics arrived.

A CareFlight helicopter attended the scene and the patient has been transported to Royal North Shore Hospital.

Ambulance Inspector Carolyn Parish tells Deborah Knight he is in a critical but stable condition.

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The driver of the station wagon, an 18-year-old man, will undergo mandatory testing.