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A teenage motorcyclist remains in hospital after his bike crashed into a chalk bank near Maidstone.
The motorcyclist, a 19-year-old man from the Maidstone area, was taken to a London hospital by air ambulance where he remains in a serious condition.
The road was closed for around four hours following the incident.
Officers are working out what happened and are urging anyone who saw the black Yamaha in the moments leading up to the crash, or who have dash cam footage from the area around the time, to contact them.
Witnesses or those with dash cam footage should call 01622 798 538 quoting SM/DJ/58/19 or email sciu.td@kent.pnn.police.uk.