A stretch of the A14 in Cambridgeshire was closed after a lorry leaked 1,000 litres of sulphuric acid onto the road.
Police were called at 6.57am to Catworth to reports of a tanker leaking sulphuric acid onto the road.
One lane was closed causing 30 minute delays on the eastbound carriageway between junction 16 for the B660 and junction 17 to the west of the Brampton Hunt/A1 interchange.
There were long delays for motorists heading towards Huntingdon and the A1.
The road has now fully reopened and all lane closures have been removed.