The A2 was closed in both directions after a major accident near Dartford Heath earlier this morning.
The crash happened at around 9.20am near the junction with Old Bexley Lane.
A 30-year-old man has been taken to Queen Elizabeth Hospital in Woolwich with leg, chest and abdominal pains.
Kent-bound traffic has now been released after congestion was all the way back to the Black Prince Interchange.
- UPDATE: Murder in Thamesmead - 11 arrests after fatal shooting
- Snow and ice chaos this weekend? Just don't shoot the messenger...
- UPDATE: Met Office warn drivers to expect icy conditions over the weekend
- Woolwich's mystery blue fox has been put to sleep by the RSPCA
- Three drivers asked to come forward after motorcyclist's death from Loampit Vale, Lewisham, crash