Hundreds of motorists are falsely registering their cars as ambulances, avoiding more than $200 in fees.
The NZ Transport Agency said last month's figures showed 2681 vehicles were registered as ambulances.
But St John and the Wellington Free Ambulance services have only 705 registered ambulances between them - meaning up to 1976 private vehicles could be falsely registered.
An ACC levy exemption for ambulances means it costs only $52.11 a year to register a non-commercial ambulance, compared with $280.55 for a petrol-driven passenger car - a difference of $228.44.
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