Pictured: The teenage girl who played chicken on the M4 - while her friend filmed her and put it on YouTube

The pictures later turned up on YouTube with comments encouraging the girl to do the stunt again.

Police were examining the images filmed on a fast stretch of the M4 in South Wales.

Here it comes: The girl takes her life in her hands as she dashes towards a giant truck

Near miss: The girl narrowly missed being hit by a lorry as she played chicken on the M4

The girl - aged about 15, - is seen running into the road causing a sportscar to swerve onto the hard shoulder.

Seconds later she walks into the carriageway and into the path of a thundering juggernaut - missing it by inches.

YouTube have removed the 16-second clip which had been viewed more than 600 times.

One message to the girl said: 'u complete syco haaa! your mad i love you like.'

The crazy game of dare was filmed by another teenager standing on the verge of the two-lane stretch of motorway near Port Talbot.

She was filmed running towards a passing car. The footage was later posted on YouTube

Motorway mayhem: The teenager narrowly avoids the speeding Mazda sports car

South Wales Police condemned the teenagers saying they were risking their own lives - and the lives of innocent motorists.

Inspector Huw Griffiths added: 'Inappropriate behaviour on the motorway is extremely dangerous, not only for the perpetrator but for other road users as well.

'This is a very unusual incident and we will be liaising with the Crown Prosecution Service to consider any criminal charges.' 

Port Talbot Councillor Andrew Tutton called on YouTube to police their site better.

He said: 'Some type of censorship needs to be put in place - it's encouraging children to have their 15 minutes of fame.

'They don't realise the dangers of what they're doing, they could easily have caused a pile-up.'

YouTube said it is constantly monitoring the content of its  site.

Despite her actions being condemned by police, the teenager appears to have escaped unscathed

A spokesman said: 'We have clear policies that prohibit inappropriate content on the site.

'When users feel content is inappropriate they can flag it and our staff then review it as quickly as possible to see if it violates our terms of use.

'If users repeatedly break these rules we disable their accounts.'