A Canterbury highway will close this morning to move a truck and trailer unit that rolled.

Police said the crash happened just after 3.30am on Mouse Point Rd, Hurunui.

The driver wasn't injured but the truck is blocking one lane of State Highway 7 between Caithness Rd and Flintoft Mouse Point Rd.

Police said the road will be fully closed after 7am so the truck and trailer unit can be removed.

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There are no diversions and motorists are asked to avoid the area.

Anyone wanting to use the road this morning should expect lengthy delays.