The Orwell Bridge near Ipswich has reopened after emergency services were called to an incident.
Police, fire crews, the ambulance service and the coastguard were called to the bridge shortly after 1pm on Sunday, a Suffolk police spokesman confirmed.
Heavy traffic started to form on the eastbound and westbound carriageways between junctions 56 and 57, and motorists are being advised to use alternative routes.
Suffolk police later confirmed the A14 had been closed in both directions between junctions 56 and 57.
At 2.45pm, they said the eastbound carriageway had reopened between Wherstead and Nacton, but one lane of the westbound carriageway was still closed.
It fully reopened a short while later.
No further details about the incident have been released at this stage.
Join our Suffolk Breaking News Facebook group to be the first to see breaking news stories in the county.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here