A section of a busy motorway was shut for hours on Thursday evening after a lorry overturned, spilling acid across the road.
Chemicals streamed across both carriageways of the M11 near Stansted Airport in Essex after the tanker turned on its side just after 5.10pm .
The motorway was closed between junction 7 and 8 while police and fire crews assessed the spill and attempted to clean it up.
After Essex County Fire and Rescue Service drafted in specialist scientists, the chemicals were identified as phosphoric acid and melamine formaldehyde resin. As well as having medical uses, phosphoric acid is generally used in fertilisers, food additives and cleaning products.
A spokesman from the fire service said he was not aware of a health threat to the public but urged travellers to avoid the area and look for an alternate route .
Essex Police said it was working with the Environment Agency to clean up the spillage, while the ambulance service dealt with the driver's injuries, which were only minor.
No other vehicle was involved in the accident.
Copyright Press Association 2014