The cause of a defect on the A14 near the Orwell Bridge has been revealed.
It was discovered on the eastbound carriageway between junction 57 for Nacton and junction 58 for Bucklesham.
One lane has been closed on the major route heading towards Felixstowe throughout Tuesday.
READ MORE: Live updates as drivers face rush hour delays on A14
A spokesman for National Highways said: "Repairs are required to a defect in the road surface on the eastbound side of the A14, caused by extreme heat.
"We are looking to minimise the disruption as much as possible by carrying out resurfacing work overnight.
"A full closure of the carriageway will be needed but we hope to have the road fully reopened during tomorrow.
"We thank motorists for their patience."
READ MORE: Road MELTS as temperatures soar above 30C
A lane closure may also need to remain in place on Wednesday to allow the tarmac to cure.
It is likely to cause delays for tens of thousands of people heading to the first day the Suffolk Show in Trinity Park.
Elsewhere in Suffolk, motorists have been advised to avoid the A143 in Stanton which melted due to the heat.
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