The A14 outside of Stowmarket has been cleared after a tipper truck dropped debris on the westbound carriageway.
The AA traffic map said one lane of the road had been blocked, with traffic travelling at around 10mph, following the incident.
Suffolk police confirmed officers had been called to the scene shortly after 9am on Wednesday after receiving reports of a tipper truck dropping debris on the road.
A police spokesman said mud, stones and rocks had been dropped and a rolling roadblock had been put in place.
Stowmarket police confirmed on Twitter that the road had been cleared at around 11.30am.
The delays came after traffic built up in rush hour on the outskirts of Ipswich.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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