A small percentage of Aucklanders have been caught using phones while driving.

A six month Waka Kotahi safety camera trial across the city picked up 2.4 percent of drivers holding cell phones.

There were 242,000 potential offences, including not wearing seatbelts.

Fines won't be issued as police weren't involved.

Road safety campaigner Greg Murphy says that was with only three cameras, picking up activity at a given moment.

"So what's to say that someone that drove past that camera- 2 seconds later, picked up their phone? That person's never going to be registered by them."

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