The A12 near Wangford has been partially blocked after a crash between a Mercedes and a Ford car.
Suffolk Constabulary confirmed they were called to the accident on the southbound carriageway near Wangford shortly after 1pm on Friday.
Police and fire crews arrived to find one of the cars on its side, blocking the road.
Pictures suggest the Ford KA was the vehicle which toppled as a result of the crash.
Police said recovery vehicles were en route while traffic is building.
The injuries of the two drivers are believed to be "not life changing or life threatening" and "possibly minor".
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