The A21 is closed northbound between A228 (near Pembury) and the A26 (near Tonbridge) due to a serious collision.
Kent Police are on scene conducting an accident investigation.
Road users are being diverted via the hollow square diversion route:
Exit the A21 at the A264 Pembury road junction and then turn east on to the A228 towards Pembury.
Then continue on the A228 until the roundabout with the B2017 Tudely road.
Take the exit on to the B2017 Tudely road.
Continue on the B2017 until the A26 junction and turn west on to the A26.
Continue on the A26 and then take the A2014 to rejoin the A26 northbound