Police were called to three accidents near Whangārei, Tokoroa and the Coromandel. Photo: RNZ / REECE BAKER
State Highway 25 on the Coromandel Peninsula is blocked, after a crash involving three vehicles.
Several people are believed to be seriously injured.
Police said diversions are in place near Whangapoua and Matarangi.
They earlier warned State Highway 1, north of Tokoroa, was expected to be closed for most of the day, after a crash that left one person critically injured.
The two-vehicle collision happened near the intersection with Tamatea Road at 9.50am Thursday.
Diversions were in place at Rollett Road and Wiltsdown Road, but drivers were encouraged to avoid the area or delay travel if possible.
Meanwhile, a person suffered critical injuries, after a truck hit a pedestrian in Whangārei.
State Highway 1 was closed in the suburb of Raumanga, after the crash about 9.30am Thursday.
Police said the incident left one person with critical injuries.
The highway was closed in both directions, with traffic diverted via Tauroa Street and South End Avenue.
Emergency services remained at the scene and the police Serious Crash Unit was notified.
The incident caused major delays in Whangārei, with northbound traffic backed up beyond the city's southern limit and southbound traffic queued almost as far north as the intersection with State Highway 14, a Google live traffic update showed on Thursday morning.
Sign up for Ngā Pitopito Kōrero, a daily newsletter curated by our editors and delivered straight to your inbox every weekday.
