Wellington's Ngaio Gorge was shut down this morning as contractors worked to clear a large landslip.
Police said the slip blocked the gorge road, an arterial route to and from Wellington's northern suburbs.
Roadblocks were put in place and motorists were asked to avoid the area.
Traffic on the backroad, between Khandallah and Wilton, was reduced to a crawl as commuters sought alternative ways into the central business district.
The Fire Service has been called in to hose down unstable debris left on the hillside.
After several days of rain in the capital, many other smaller slips have been reported around the hill suburbs.
On Sunday, traffic on major routes linking Wellington, Porirua and the Hutt Valley was badly disrupted by a slip that closed northbound lanes on State Highway 2, just south of Petone, for four hours.
- The Dominion Post