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The family of a mum and her three children who were killed on the way back from a family holiday want every driver to watch the devastating seconds before their death.
The horrific footage shows a lorry smashing into a row of parked cars while the driver peers down at his mobile phone while on the motorway.
Lorry driver Tomasz Kroker had been changing the music on his phone when he ploughed into stationary traffic in 2015.
He killed Tracy Houghton, 45, and her sons Ethan, 13, and Joshua, 11, as well as her partner's daughter, Aimee Goldsmith, 11.