A Gold Coast mum has been involved in a terrifying road rage encounter while on the school run with her two young children.

The woman, from Kirra, was driving on the M1 yesterday morning when she claims another woman in a black Mazda became enraged she was driving too slowly.

Her child filmed the Mazda swerving across lanes of traffic to cut them off, hurling abuse and throwing things at the car.

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The woman said she was almost run off the road and was forced to come to a complete stop on the busy motorway.

She said the incident unfolded over a 15 kilometre stretch.