There were long delays on the A14 after police were called to a two-vehicle crash.
Emergency services were called after reports of an incident involving two cars near Newmarket at about 3.20pm on Friday.
A spokesman for Suffolk police said one lane of the westbound carriageway was closed as a result of the crash.
Fire and ambulance crews were also called, but the extent of any injuries is not yet known.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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