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A serious crash shut the A21 in both directions after a car overturned and ploughed into a lake.
Police closed the Tonbridge Bypass between the A225 and A26, leaving drivers facing long delays.
Officers were called after the car left the road and crashed into water beside the dual carriageway, sparking a lengthy recovery operation.
The incident happened at about 3.15pm, and police were joined by ambulance and fire service crews at the scene.
Three fire engines, a technical rescue unit and a water safety unit attended, as well as the air ambulance.
Drivers faced delays of up to 90 minutes during rush-hour, but the road was fully reopened at about 8pm.
National Highways officials thanked drivers for their patience.
Police have been contacted for more information.
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