A crash on the Hawke's Bay Expressway has caused cars to back up between Pakowhai and Taradale.

A truck and car have crashed and the truck which has a semi trailer unit has jackknifed.

A police spokeswoman said the crash happened at about 1:50pm between Links Rd and the Meeanee off-ramp.

"It is on the Hastings side of the bridge and it is unknown at this point if there are any injuries."

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The Commercial Vehicle Investigation unit were en route and ambulance were on scene.

Traffic management was also at the scene.

Police were also called to a car verse pole at about 1:50pm today on SH50 between Maraekakaho and

A police spokeswoman said the car overturned in to a paddock and police, fire and ambulance were all on scene.

"There were concerns about the power lines falling a bit low from the crash," she said.

Police were unsure what the injuries were and how many people were in the vehicle.