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.
The Serious Crash Unit is investigating, police said.