A car left the road and came to rest on its roof after the incident at 3.15pm just before the Swavesey junction on the eastbound carriageway. Firefighters released one person from the overturned car. One lane is closed to help recovery of the vehicles. A Highways Agency spokesman said they expected the road to have normal conditions again by 5.30pm. Traffic around Huntingdon is travelling around 13 miles per hour as queues back up.