The A31 at Ringwood is closed after a serious crash overnight.
The eastbound carriageway, heading towards Southampton, has been closed for seven hours.
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The road is closed eastbound between Ringwood and the M27.
Hampshire Police are on the scene and the road is expected to remain closed through the morning period.
National Highways said: "Traffic is being diverted via the A338 northbound into Salisbury, then onto the A36 eastbound to M27 J2."
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