Heavy snow had fallen in the area of the infamous Drumochter Pass, and the road closure was caused by a Tesco delivery lorry crashing off the road.
One picture posted on social media showed the accident.
Traffic Scotland confirmed that the closure begun around 7am on Sunday at Wade Bridge-Dalnacardoch Lodge.
Then just before 12pm they announced the lorry had been removed and the road reopened.
However delays are expected to continue in the area for some time.
BEAR Scotland, who manage Scotland's North West trunk roads, are using ploughs to escort the traffic through.