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A man was flown to a London hospital following a crash between a tractor and a lorry.
Police are appealing for witnesses to come forward after the incident on the A257 Roman Road at Wingham at 1.25pm.
It caused a blockage and the busy road connecting Canterbury with Sandwich was closed until after 10pm.
This morning police released an appeal.
A statement from the force said: "It is understood that both vehicles were travelling in the same direction, heading towards Wingham, when the incident took place just outside the turning for a farm shop near Shatterling.
"The driver of the tractor, a man in his late 40s, suffered a serious head injury and was taken to a London hospital for treatment where he remains in a critical condition."
The incident happened outside a farm shop and involved a white Scania truck and a Massey Ferguson tractor.
Officers from the Serious Collision Investigation Unit (SCIU) are urging any witnesses to come forward with information.
Witnesses including those people who may have dash cam video footage of the incident are asked to phone the dedicated SCIU witness appeal line on 01622 798538 quoting reference number RY/FM/017/21 or email sciu.td@kent.pnn.police.uk