All possible.
I think that the slip road which I see is also up a hill is close enough to effect this incident. I had thought from earlier photos that it looked further away but it isn't ...
From what I think, I might have put together the first incident - the J B Wheaton lorry (the front one), has just a little o/side front damage which makes me wonder if his accident (however caused) started the train of events (NOT that they all should not have been travelling responsibly and carefully).
The two cars around that vehicle might indicate the first set of mistakes.
The silver car a little further back which looks undamaged or little damaged is, (I think) where the earlier witness recounted getting out and helping others.
The Daily Mail recounts a witness here :
http://www.dailymail.co.uk/news/article ... ident.html (detailed photos), that
Daily Mail - Mr Tom Hamill, wrote:
One of the most extraordinary accounts of the crash came from teacher Tom Hamill, who spoke of rescuing a baby amid the carnage.
Mr Hamill, 25, said a woman, whose car was destroyed, had been struggling to carry her baby and toddler to safety. ‘She was screaming, “Take my baby,”?’ he said.
‘So I took her baby and carried it over the central reservation where I was met again by the mother.
‘She was dragging her toddler away. While I was there a bumper flew off a car and zoomed over my head, I heard my girlfriend scream, “Watch out”.
He said that his car was caught in what he saw as the ‘second wave’ after the initial accident.
He, his girlfriend Katherine Lane, 24, and father George Hamill, 56, were travelling in a Renault Megane which had just joined the motorway at Junction 25.
‘We managed to stop because we had just joined the motorway and were not going too fast,’ he said.
‘But a car came by within seconds at about 70mph and went straight into the lorry in front of us.
‘We are all lucky to be alive. If we had been one yard to the right we would not be here to tell the tale,’ he said.
‘It was just the wall of fog. It was so thick, like driving in emulsion paint, and so sudden. As we came through it, there was a wall of lorries. One jackknifed in front of us.’
Mr Hamill, a music and drama teacher at Merchants’ Academy secondary school in Bristol, praised paramedics and described their efforts as ‘superhuman’.
Read more:
http://www.dailymail.co.uk/news/article ... z1csT7TBzlSo that implies fog .... nothing like witness that all help to confuse the issue (already!) However if the fog bank was moving down the motorway then this might help to explain why some saw the 'fog' it and others didn't, or at least less so. Plus the lorries will have helped to disperse the fog cloud too ....
Add this account of fog too :
Motorist James Spurling, of High Wycombe, said: "I had just passed the spot where the accident happened just before 8:30.
"I, along with a car on the inside lane, had to brake very sharply as we both hit a solid wall of white that came out of nowhere.
"The visibility was instantly down to less than three metres and I would say was approximately 200 yards thick, once out the other side it was completely clear."