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.
- POLL: Study shows people turn to takeaways and alcohol when stressed out
- Caught speeding? Court revolutionises how cases are heard
- UPDATE: Man rushed to King's College Hopsital after 'serious' crash in Bromley
- Crowd trouble at Rotherham v Millwall game
- Fawkham nudists battle to save caravans at naturist club