Motor industry lobbyists are citing "huge" regional variations in the ages of vehicles on New Zealand roads in their campaign against any loosening of the existing warrant of fitness system.
Although the average age of the national fleet is 13.03 years, Government statistics reveal a wide range from 10.3 years in central Auckland to 16.8 years in Waimate in south Canterbury.
That has prompted the Motor Trade Association, representing repair workshops and service stations, to warn policy-makers to think twice before changing the existing requirement for six-monthly warrants of fitness for any vehicle more than six years old to be allowed to stay on the road.
The warning comes as the Government is expected to choose in the next fortnight from four potential alternatives, such as annual inspections for the first 12 years of a vehicle's life, as favoured by the Automobile Association and about 70 per cent of its members.
Although Australian university researchers believe that could save motorists up to $250 million a year, the MTA warns it could be at the cost of 80 more annual road deaths.