State Highway 7 has reopened to one lane of traffic with a stop/go in place, after having been closed earlier due to a crash.

"Motorists should take extra care when driving in the area," said Steven Mann, Travel Information Advisor, Christchurch Transport Operations Centre.

One person is dead after a car crashed into a tree just before 7.30am at the intersection of State Highway 7 and Hurunui Bluff Road.

Police and emergency services are attending to the fatal crash in the Hurunui District.

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The Serious Crash Unit is investigating, police said.