TRAVEL UPDATE: A259 re-opened after collision.
The road has since reopened on the affected stretch between B2259 Chichester Road and B2144 Drayton Lane following the incident near Merston.
A second incident has also been reported on the B2166 diversion route through North Mundham.
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Hide AdAn ambulance service spokesman has now confirmed two cars were involved in the collision.
He said a female driver was treated for a head injury and chest pain and taken to St Richards Hospital.
A second accident was reported soon after on diversion route through B2166 Lagness Road affecting traffic both ways at School Lane near North Mundham Primary School.
Delays are easing.