A large trailer full of "potentially hazardous" waste abandoned in a layby next to the A1 is "too heavy" to be towed away, the local council has said.
South Kesteven District Council (SKDC) said it did not know how long the trailer at Great Ponton, Lincolnshire, had been there, but the Environment Agency (EA) said it could have been there "for several months".
National Highways said the trailer was fly-tipped and contained "an amount of potentially hazardous waste, which needs specialist removal."
Lincolnshire Police said it was investigating after a woman in her 60s was injured when her car crashed into the trailer on Sunday, leading to a closure of the A1 southbound for nine hours.