The New Zealand Transport Agency plans to phase in a 12-month warrant of fitness from October, nine months earlier than originally planned.
NZTA proposed today that vehicles first registered between 2004 and 2008 would receive a 12-month WoF following their next successful inspection from October 1 this year.
Other changes would come into place next April.
Transport Minister Gerry Brownlee said the changes would save $1.8 billion over 30 years and modernise the 70-year-old WoF inspection system while maintaining road safety.
But Motor Trade Association spokesman Ian Stronach said the shift in the timing was a shock to the industry and the changes would mean a significant reduction in business activity and vehicle safety levels.