Traffic between Manse St and Russell Rd on Western Hills Dr in Whangarei is down to one lane due to a water leak.
The leak was discovered by a New Zealand Transport Agency staff about 3pm today and repair teams are on site.
One of the two north-bound lanes is closed between Manse Street and Russell Road on state highway 1.
NZTA does not know how the leak started or how long it will take to fix it and to re-open both lanes.
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"The Transport Agency apologises for any delays during peak time traffic and thanks drivers for their patience and understanding."