This was the scene after a trailer being pulled by a tractor flipped over in London Colney.
The accident occurred in Coursers Road at about 5.45pm on Saturday.
The trailer was carrying some kind of shredded vegetation, which spilled out onto the floor.
An eye witness said: "The tractor driver, who had already started turning the corner, was forced to make the turn tighter to avoid collision with a lorry coming out of the turning. The trailer tipped over and flipped the tractor up onto its front wheels.
"It could easily have been fatal. The road was busy at that time and if the trailer had fallen on a car, it would have crushed it."
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here