Scepticism over whether handing over speed camera duties will reduce fatal speed-related crashes.

NZTA is taking over the job from Police, with plans to increase the number from 150 to around 800, as part of a high-tech development of the network.

It's estimated to process around three million infringements annually by 2030.

But road safety campaigner Clive Matthew-Wilson told Mike Hosking it doesn't target those who cause most of those accidents.

He says those who actually cause them are a very small group of poorly educated people, usually with substance abuse problems and an attitude.

LISTEN ABOVE