A CRASH on the Spur Road is causing delays for motorists this morning.
The collision, involving three cars and a motorbike on the northbound carriageway, took place at just after 8am near Ashley Heath roundabout.
Traffic is at a standstill and queuing for several miles. Northbound is believed to still be completely blocked.
Police and ambulance are on the scene.
Lane one is now open but lane two remains closed due to debris on the carriageway.
The road was shut for a short time from Blackwater junction, a spokesperson for Dorset Police said.
The vehicles include a blue Volkswagon Scirocco, a silver Renault Clio, a black Suzuki motorcycle and a blue Audi A3.
Recovery is needed for the Audi.
There are currently no details on any injuries, Dorset Police said.