There are certain aspects of car ownership which politicians continually want to tweak and in doing so, send mixed messages about their respective priorities.
Every car on the road in New Zealand needs to have a current warrant of fitness (the WOF) and a current certificate of registration (Rego). The Rego means your vehicle is legal to be on the road. The WOF means that, at date of issue, the vehicle has satisfied a list of over 60 factors which make it safe to be on the road. You can't renew your Rego without having a current WOF.
Both WOF and Rego have a date of issue which can easily pass the notice of the car owner, who could face a $200 fine for failing to display a current Rego or WOF. Much of the enforcement of these is in the hands of local authority parking wardens. The $200 fine is one of the highest fine levels for any traffic offence and the cynic could suggest that targeting WOF and Rego expiry could be a nice little earner for a council's bottom line. There needs to be a sense of fair play as well as road safety considerations here.
The two systems have different forms of delivery. The annual vehicle licensing system is delivered through NZTA and the vehicle owner is sent a reminder about its potential expiry.