The incident happened on the A12 between Martlesham and Woodbridge (Image: Google Maps)
There were severe delays on the A12 in east Suffolk after a passenger suffered a medical episode in a layby.
The incident happened on the road between Martlesham and Woodbridge shortly before 11am on Monday, Suffolk police said.
A police spokesman said ambulance crews were attending a medical episode in a layby off the A12.
The A12 remained open while emergency services attended the scene.
According to the AA traffic map, drivers formed lengthy queues on both the northbound and southbound carriageways shortly after the incident.
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