"How they walked away I do not know. They must have a guardian angel. This potentially could have been a hell of a lot worse than it was because so many vehicles were involved.
"It has been a very lucky escape for an awful lot of people."
Three motorists were injured and others treated for shock after the pile-up, near junction 5 at just after 8.30am.
The motorway was closed westbound between junctions 5 and 6 for six hours as emergency services worked at the scene.
The driver of a Range Rover, which toppled over on to its side in the crash, suffered back injuries.
Two male occupants of a silver Vauxhall Astra, who were industrial clean-ers from Wigan heading to work in Liverpool, were walking wounded.
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