The lorry collided with a barrier at around 1pm, causing "significant damage" and miles of tailbacks.
The main M25 carriageway is closed anti-clockwise within J2 near Dartford as a result of the accident, and the A2 is closed in both directions within the Darenth Interchange.
Source: https://www.newsshopper.co.uk/news/19216447.dartford-m25-crash-leaves-lorry-dangling-bridge/