A crash on the Orwell Bridge near Ipswich is causing delays, after a lane was closed to deal with the incident.
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Tailbacks are expected between junction 57, at Ransomes Europark, and junction 56, at Wherstead.
A spokesman for Suffolk police said officers are not sure at this stage how many vehicles were involved in the crash.
Drivers travelling on the A137 are also facing delays at the Wherstead junction of the A14.
It is believed that recovery of the vehicles involved is under way.
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