Part of Dawson Rd was cordoned off and Auckland Transport warned motorists that a section between Preston Rd and Flat Bush Rd was blocked about 7.35am because of a "police issue".
"Please avoid this area or allow extra time for diversions."
Nearby Dawson Primary School posted a message to its Facebook page reassuring parents that the situation was under control.
"We have spoken to the police and the incident on Dawson Rd this morning has been resolved. The road and school are open as normal."
Police said just after 8am that the cordons had been lifted.
"Police are speaking to the person and our inquiries are ongoing," a spokeswoman said.