Police say they are gathering evidence in order to prosecute anti-government protesters who shut down part of the Auckland motorway yesterday.
More than 1000 people marched in the protest, organised by a group associated with Destiny Church.
Police says they are identifying offenders who walked on to the motorway and committed some driving offences.
Some motorcyclists were riding without helmets, while children were seen riding in the back of utes.
Auckland Central Area Commander Inspector Graeme Anderson said officers have not yet arrested, charged, or summonsed anyone and he would not say how long the process will take.
Anderson said yesterday the decision by the organisers of the protest move out onto the motorway had been "reckless behaviour" and authorities had not been informed until after the march had started.