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Make no mistake this is unpleasant and shocking viewing.

But police and their grieving family want you to see it in a hope that it convinces drivers to avoid the temptation of being distracted by their mobile phones.

The harrowing footage shows the moment that a driver took his attention off the road and in an instant snuffed out the lives of a mother and her three young children.

(Image: PA)

The decision is a deliberate attempt by Thames Valley Police to horrify complacent and irresponsible drivers into changing their behaviour that is causing death and devastation.

On August 10, 2016 a family were returning home in two cars from a camping holiday in Devon. As they got in stuck traffic a lorry driver on his mobile failed to see them.

By the time he realised what was happening and slammed on the brake it was all too late. The lorry's driver, Tomasz Kroker, can be seen clearly on the cabcam. Another camera shows the destruction caused.

(Image: PA)

Crashing into the back of the family's car Tracy Houghton, 45, and her son, Ethan, 13, died alongside her 11-year-old son, Josh, and her partner's 11-year-old daughter, Aimee Goldsmith.

A further 12 people were injured - including one seriously - in the rush-hour collision on the A34 in Berkshire, which involved four lorries and four cars.

Surrey police officers recently made a lorry driver look at the footage after being caught using his phone behind the wheel, reports Get Surrey .

In interviews Aimee's mother, Kate, said: "I continue to see drivers using their phones. It sickens me.

(Image: PA)

"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?"

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.

(Image: PA)

(Image: PA) (Image: PA)

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.

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.