The A14 was closed eastbound towards Ipswich due to an oil spill which caused severe delays.
The carriageway was closed from junction 46 at Thurston to junction 47 at Woolpit, with delays of at least 15 minutes covering several miles of the eastbound road.
Police have confirmed that the road has now reopened.
Officers were called to the incident just before 11.45pm to reports of a container on the carriageway.
Highways England had resources deployed to restore the normal conditions.
Motorists were advised to expect disruption with extra journey time and potentially having to re-route their journeys.
Road users are advised to exit the A14 eastbound at junction 43 St Saviours and follow the A143 through Great Barton to the A1088 roundabout at Ixworth. At the roundabout take the fourth exit on to the A1088 through Stowlangtoft and Norton to re-join the A14 at junction 47 Woolpit.
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