The incident happened at 5am on Friday (August 23) close to junction 31 for Samlesbury on the southbound carriageway.
Lancashire Road Police have revealed that the first car, a black Jaguar, hit the central reservation and was left stranded in lanes three and four.
After this the second white car, believed to be a VW Golf, collided with the stranded car.
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Photos of the crash were posted to Twitter, showing the devastation to the black car's front and rear as well as the front of the VW Golf.
A road police spokesman said there was "debris everywhere".
They continued by saying "apologies if any delays caused" and to "blame them, not us".
The drivers both had only minor injuries, they added.