Traffic came to a grinding halt on a central Auckland motorway on Thursday after citybound lanes were closed following a police issue.
Emergency services were called to the scene on the North Western Motorway near Kingsland just before midday.
The New Zealand Transport Agency - Waka Kotahi (NZTA) earlier said all lanes eastbound on State Highway 16 had been closed after the St Lukes Rd off-ramp.
All but two lanes were opened at about 12:30pm, though heavy traffic persisted until they were both reopened at about 2:10pm.
"Traffic remains heavy in the area. Continue to pass the scene with care and be prepared for some delays," they wrote.
Two ambulances and a fire truck were earlier at the scene.
Google Maps traffic data had shown traffic was moving very slowly near the St Luke's on-ramp and on the motorway by the Bond St overbridge.
Police said they were called to the incident shortly after midday.