Traffic cameras could become more common as NZTA takes over the responsibility from police.
It will increase the number of cameras from 150 to 800 operating within the next 10 years, manned by as many as 400 staff.
It estimates they could process three million speeding infringements a year.
Road safety campaigner Clive Matthew-Wilson says extra traffic cameras are unlikely to make much of a difference.
"I don't think it's going to solve the problem. There's international studies that make it quite clear- a high police presence has a profound effect on the way that we drive."
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