Police are appealing to people in Christchurch to stay off the roads unless absolutely neccessary so essential supplies and equipment can get through.
Superintendent Dave Cliff says the volume of traffic returning to the roads is hampering deliveries of items such as food and water and those thinking of driving need to be more public-minded.
He says congestion is becoming a problem and people should make trips only if necessary and keep them as short as possible.
Civil Defence again assured the people of Christchurch that they will not run out of food or fuel supplies.
Director John Hamilton said on Friday the bulk supply of petrol and diesel is still coming into the city, and there is no need for people to stockpile.