A grieving family and police have urged every motorist to watch this video if they are tempted to pick up their mobile phone.

The harrowing footage shows the moment a lorry driver crashes killing a mum and her three children who were on their way back from a family.

Driver Tomasz Kroker had been changing the music on his phone when he ploughed into stationary traffic in 2015, killing Tracy Houghton, 45, and her sons Ethan, 13, and Joshua, 11, as well as her partner's daughter, Aimee Goldsmith, 11.

Police released the distressing footage in a bid to stop drivers using their phones at the wheel, reports Get Surrey .

Handout dashcam issued by Thames Valley Police of Tomasz Kroker looking at his mobile phone while driving his lorry just before he killed a woman and three children by ploughing into their stationary car while scrolling through music on his mobile phone as he has been jailed for 10 years

Josh and Ethan's dad, Doug, said the youngsters had been planning on playing Pokemon Go in Hyde Park when they got back from their holiday.

He said: "I thought that was the worst day of my life, my kids being killed. But I think it was three weeks later when I went to the funeral director's and actually saw them, dead, cold, in their coffins."

Aimee's dad, Mark, said the children "couldn't wait to get home" to play Pokemon and said they hugged and kissed before getting into the car.

Aimee Goldsmith, 11, also died in the collision

In the video clip, Aimee's mum, Kate, recalled in tears how the police had knocked on her door and told her her daughter had been killed in a car accident. She said her daughter wanted to be a vet.

"I continue to see drivers using their phones and it sickens me," she said.

"If they had seen the devastation they brought my family, or to other families, by using phones, illegally... distracting themselves from driving a potential weapon...

"Would they be as sickened as we are?"

Lorry driver Tomasz Kroker, 30, was jailed for 10 years

Kroker, 30, was jailed for 10 years at Reading Crown Court after pleading guilty to four deaths by dangerous driving and a single count of causing serious injury by dangerous driving.

It was revealed he was scrolling music selections for almost 1km on the A34 near Newbury.

After his conviction, former Gloucestershire police chief constable Suzette Davenport said it was up to the public to make it socially unacceptable to use your mobile at the wheel.

Tomasz Kroker fiddling with his mobile phone while driving his lorry seconds before he killed a woman and three children

Nationally, the number of mobile users who text, make calls and check social media accounts has risen and "distracted driving" is expected to be the biggest single cause of death and injuries on the roads.

The lorry driver from Andover, Hampshire, pleaded guilty to four counts of causing death by dangerous driving.