Aucklanders are being warned that it could be a slow commute to work this Wednesday morning.
The New Zealand Transport Agency (NZTA) says a breakdown after Newmarket Viaduct is blocking the right lane. Motorists are being asked to merge left to pass with care and to expect delays.
A crash near the Coatesville-Riverhead Highway is delaying traffic, NZTA says.
"Please follow directions of emergency services," the agency advises.