The Transport Agency has estimated 95 percent of the country's open roads should have their speed limit dropped from 100km/h to 60-80km/h.
NZTA has released its online risk assessment tool called Mega Maps, which calculates what the ideal speed limit should be using information such as crash history, road conditions and traffic volumes.
It is also recommending speed reductions on most city streets down to between 30-40km/h.
Their public release comes after Transport Minister Julie Anne Genter last month said the government's Vision Zero road safety plan seeks to drop the number of road deaths by half in the next decade and one tool was to reduce speed limits.
The Road Transport Forum represents the trucking industry. It's chief executive is Nick Leggett. He talks to Susie Ferguson.
