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Four people are being treated in hospital following an accident on part of the A21 in Tonbridge.
A car carrying the group came off the road near the Blue Boys roundabout yesterday afternoon.
Three of them were taken to Pembury while one was taken to King's in London.
While emergency services responded to the incident, a road closure had to be put in place. The Highways Agency said both carriageways were closed near Kippings Cross.
The road was shut for around two hours and reopened just after 7pm.
Posting on Twitter one witness said they saw a car “fly through the air across the roundabout.”