The motorway was closed to Belfast-bound traffic between junction nine at Moira and junction eight at Blaris following the collision.
Motorists reported long delays, with one driver taking 76 minutes to travel between Lurgan and Moira.
Traffic diversions were in place during a clean-up operation to remove debris from the motorway.
According to Transport NI, approximately 52,000 vehicles travel this stretch of road, in both directions, over a 24-hour period.
They said on average, 4,300 motorists are on the road at 07:00 BST.

The 28-year-old Scotland international has spent the last two seasons with Wasps, having previously had a six-year spell with Glasgow Warriors.
"His style fits the way we play perfectly and he will provide excellent competition," said incoming Quins director of rugby John Kingston.
"We are looking forward to adding his expertise next season."
Harlequins have not disclosed the length of Jackson's deal at The Stoop.
Jackson has won 28 caps for Scotland since making his Test debut against New Zealand in 2010, and made one appearance at this year's Six Nations.
"I'm extremely excited to be starting a new challenge with Harlequins," he said.
"After speaking to John Kingston and Conor O'Shea I could see how great a club it is."
Kingston will replace O'Shea in charge of the south-west London club this summer, with O'Shea leaving the club to take charge of Italy.

The 82-year-old was threatened by two masked men who came to the door of his home in Gillies Lane, Baillieston, at 22:15 on Thursday.
The attackers pushed the pensioner and demanded money, before searching the house and leaving empty-handed.
Both men were wearing balaclavas and dressed all in black. Police have appealed for information.
The men, one of whom is thought to have been wearing a black "puffa" or bomber jacket, made off in the direction of Bredisholm Road.
Det Sgt Raymond Hunter, from the community investigations unit in Pollok, said the incident was "very frightening" for the victim.
He said: "We have been checking CCTV and speaking to neighbours but need to hear from people who may have been in the area at the time. There is a pub at the top of the lane on Bredisholm Road, so we would appeal to patrons from there to get in touch if they saw or heard anything.
"At this time we still have to establish why the man was targeted. The suspects seemed to think he had a significant amount of cash in his home, which was not the case, hence the reason they left empty-handed.
"Whether this was mistaken identity or a rumour, we do not know, but in any case to subject an elderly man in his home to this, is not just wrong, it was cowardly."

Celtic skipper Scott Brown has led Gordon Strachan's national team recently but fit-again Fletcher is back playing at West Bromwich Albion.
"Scott has flourished under it when Darren's been injured," Wilson told BBC Radio Scotland.
"But Darren's more the leader of the country and has been for many years."
Wilson, who won his only international cap against Northern Ireland in 2011, added: "We're lucky that we've got two inspirational players in the middle of the park that can take that role.
"It is probably the biggest honour you can receive in football, so I think it matters a great deal, especially to the players involved - Scott and Darren.
"It will be of great importance to both of them, but I don't think either of them will be too disappointed or let it affect their game if they are not selected as captain."
Wednesday's friendly against Michael O'Neill's side at Hampden comes before Scotland's next Euro 2016 qualifier versus Gibraltar on Sunday.
"This game has been well selected by both sides," said Wilson, who now plays for Dumbarton after spells at Dundee United and Celtic.
"Quite often you can have these international friendlies that sort of peter out into nothing - a kind of drab affair.
"But with two competitive teams and players that have played against each other at the highest level in England and Scotland coming against each other, it gives it that extra bit of needle that you need."
A collision between two lorries caused part of the M1 to be closed for several hours, causing long tailbacks.
[NEXT_CONCEPT]
Harlequins have agreed to sign fly-half Ruaridh Jackson from Premiership rivals Wasps ahead of next season.
[NEXT_CONCEPT]
An elderly man has been assaulted in his Glasgow home during an attempted robbery.
[NEXT_CONCEPT]
Darren Fletcher's past experience leading Scotland could win him the captaincy against Northern Ireland, says former international Mark Wilson.