A police spokeswoman said earlier a single car in the southbound lane had crashed through a barrier and gone down a bank into the water.
She said emergency services were working to get the person up the bank to receive medical attention.
A helicopter was on standby to help remove the car from the shallow water.
Traffic is backed up. Photo / George Novak A reporter at the scene said the crash was just north of the Maungatapu Bridge. There were multiple fire, police and ambulance vehicles on the scene.
City-bound traffic was backing up at the Baypark roundabout. Traffic was moving slowly past the scene, which was just after the two lanes merged into one.
SH29A MATAPIHI, WESTBOUND - CRASH - FINAL UPDATE 6:10PM
SH29A in Matapihi has RE-OPENED and congestion has...
Posted by Waka Kotahi NZ Transport Agency Waikato BoP on Tuesday, October 8, 2019 An area of bank has been taped off and firefighters have been seen preparing to absail down the bank.
Emergency services have taped off an area of bank. Photo / George Novak A St John ambulance said one ambulance crew and manager were on scene.
A Fire and Emergency New Zealand spokesman said it was called to the crash around 3pm.
