A teenage driver has been charged with dangerous driving after an eight-months pregnant woman walking was hit and killed in a two-car crash.

Ambulance paramedics treated the woman at the scene before she was taken to Sydney's Westmead Hospital in a critical and unstable condition but she and her baby were unable to be saved.

Emergency services responded to reports of a pedestrian struck by a vehicle at a car park entrance at Hornsby in the city's northwest ábout 8pm on Friday.

A 19-year-old man behind the wheel of a BMW and a 48-year-old male driver of a Kia station wagon were uninjured.

Both were taken to Hornsby Hospital for mandatory testing.

No other occupants were in the vehicles.

Police are expected to be allege that the Kia was struck from behind by the BMW causing it to crash

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