The A14 has been re-opened following a chemical spill.
Highways officials have re-opened a stretch of westbound carriageway between junctions 25 and 26 - between The Hemingfords and St Ives.
Delays remain in the area, with traffic still queuing back to junction 29, at Bar Hill.
Specialist teams from Cambridgeshire Fire and Rescue Service were called to the scene at about 10am to help deal with the spillage.
A spokesman for Cambridgeshire Fire and Rescue Service said: "More than 20 firefighters, including crews from Cambridge, St Neots, Huntingdon and Papworth, along with the water carrier from Ramsey and a hazardous materials unit attended the incident.
"Firefighters wearing breathing apparatus used a specialist kit provided by the Environment Agency to cover the drainage in the immediate area to ensure there was no contamination of water.
"The crews took a sample of the chemical and tested it at the scene and found it to be non-hazardous.
"The A14 was closed westbound during the incident as a precaution while the incident was ongoing."
The crews returned to their stations by 12.20pm.
Highways England confirmed at about 12.30pm that it was re-opening the road to traffic.
Motorists are being advised to expect delays.