A young woman was taken to hospital with minor injuries after the car she was driving hit and overturned a large campervan at the high-risk Hawke's Bay Expressway intersection near Westshore on Tuesday.

The crash happened when a hired Mercedes campervan driven by a Swiss tourist was struck by a southbound Toyota Corolla driven by a young Hastings woman just before 10.15am.

Constable Marty Lack said the campervan driver had stopped to give way while exiting Meeanee Quay and had then driven on to the Expressway to head north, but was struck towards the rear by the southbound car, which had braked heavily to try to avoid the collision.

He said the car went under the rear of the campervan and tipped it to a point of balance where it overturned.

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The overturned campervan blocked both lanes of the Expressway and a detour was in place while the road was cleared.

Mr Lack said the woman, aged inher 20s and whose car was "totalled", was taken to hospital by the St John Ambulance Service for observation while the tourist was understood to have been provided with a replacement campervan.

The intersection is rated 5th on the New Zealand Transport Agency's Top 100 High-Risk intersections.

The New Zealand Transport Agency said there was an "agreed plan in place" to improve the intersection where one person has been killed and more than 30 others injured in crashes since the intersection opened with the northern extension of the Expressway in 2003.