The road was closed after a crash between a van and a tanker in which 400 litres of fuel was spilt.
The A47 at North Burlingham was closed in both directions between the Beighton White House and Blofield at the Main Road junction after the crash yesterday at 10.20am which left one person injured.
A man in his early 20s - the driver of the van - suffered head, chest and neck pains. He was taken to James Paget University Hospital in Gorleston for treatment, but the East of England Ambulance Service said his injuries were not thought to be serious.
It took 15 hours for the road to reopen to allow the Highways Agency to make repairs to the road surface.
A spokesman in the police control room said last night: 'It's been a difficult evening for traffic and there's been a few knock-on consequences.
'There's been a bit of difficulty caused by vehicles going down unsuitable roads and the congestion.'
He added: 'We've put diversions in place but traffic is difficult, really difficult and it looks to stay that way.'
Approximately 400 litres of fuel had been spilled onto the road, and the Environment Agency were on the scene earlier as the oil may have contaminated surrounding waters.
Motorists are advised to avoid the area, especially during this evenings rush hour, and to follow the local diversions on the A146 and A143.
Three fire engines from Acle, Sprowston and Great Yarmouth were on the scene to assist the police.
•Were you affected by the crash? Email geraldine.scott@archant.co.uk
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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