Mother faces court after a fatal mistake killed her eight-year-old son in a car crash.

A New Zealand woman has faced court over the tragic death of her eight-year-old son, who was killed when her car ploughed into a queue of traffic.

Kim Crous yesterday pleaded guilty to one charge of careless driving causing death and two of careless driving causing injury over the April crash, caused after the 38-year-old took her eyes off the road to check a map on her mobile phone, reports The New Zealand Herald.

Napier District Court heard that James Crous, who was belted into the driver-side rear seat, suffered a broken neck from the impact and died at the scene.

Crous’ daughter was in the backseat alongside her brother, but escaped with non-life threatening injuries.

James was just eight-years-old. Image: Facebook.

The court heard that the impact occurred on Crous' trip to an address Bay View, which she had earlier entered into Google Maps on her mobile phone.

As Crous exited a roundabout, she glanced down at the map, failing to spot the 375m queue of traffic that had banked up on State Highway 2B, reports

She ploughed into the back of rearmost car, reportedly injuring those inside.

Crous is due to appear in court for sentencing on January 24.

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