The disruption is being caused by an overturned vehicle on the eastbound carriageway, Highways England have said.
The incident has happened on the A27 near Hambrook – between Chichester and Havant – and one lane is closed this morning.
AA Traffic have described the delays being caused by the overturned vehicle as being ‘severe’.
Highways England tweeted: ‘A27 eastbound Hambrook. Closures lane 1 closed due to an overturned vehicle. Emergency services are at scene and dealing. Please approach with caution.’
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