At least 12 people have been injured and one killed, in separate crashes around the country today.

A motorcyclist died in Taranaki, a man in his 60s was critically injured after rolling his car at Port Waikato and a pedestrian was flown to hospital in a serious condition after being struck at Oruanui.

The crashes, which have happened in various parts of the country, resulted in temporarily road closures and warnings for motorists to expect delays while diversions were in place.

Police say they are still investigating the fatal accident which happened at 2.25pm on Wiremum Rd, Te Kiri, in Taranaki.

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Earlier in the day four people were injured, one seriously, after two cars and a camper van crashed in Christchurch.

Emergency services were called to the scene on Main North Road between Gressons Rd and Macdonalds Lane at 12:25pm. One person had to be pulled out from one of the vehicles.

Further up the country six people were injured and part of State Highway 56 was blocked after a four-vehicle crash at Tiakitahuna, southwest of Palmerston North.

Police said two people were understood to be in serious condition and four people in a moderate condition.

One man in his 60s was flown to Auckland City Hospital in a critical condition after crashing his car on the Tuakau Bridge-Port Waikato Rd.

His car rolled several times before coming to rest on its roof just before 3pm.

Police warned motorists to expect delays as the road was closed and diversions in place.

Around the same time police were called to SH1 at Oruanui where a pedestrian was hit by a car. Police said one person was flown to hospital in a serious condition.

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Emergency services have also responded to reports a of a camper van teetering on the edge of Picton harbour. Its understood the van crashed through a bollard near Wellington St early this afternoon. There are no reports of injuries at this stage.