AA spokesman Mike Noon questioned whether focusing on drivers doing just over the limit on relatively safe urban motorways was the best strategy.
"Focusing on low-level speeding on the motorways, we think, is maybe not very beneficial. We'd prefer more focus on higher-risk areas, such as people speeding on State Highway 27 or between Turangi and Taupo.
"We get a bit concerned if there's too much focus on low-speed tolerances on motorways, particularly since some of those motorways, we think, may move to 110km/h, to reflect the safety of them."
The impact of speed cameras on New Zealand roads is stark. The number of speeding offences detected by camera has almost doubled since 2009, from 330,000 to 615,000 last year. In 2009, about half of all speeding tickets were from cameras; the rest were issued by officers.
In 2014, the cameras accounted for 70 per cent of all speeding tickets - and almost half of them were in Auckland. By comparison, Auckland accounted for only about 27 per cent of tickets issued by police nationwide.
Mr Cliff said while more people were being caught speeding, they were not speeding by as much. Open-road mean speeds had dropped from 102.3km/h in 1996 to 95.7km/h in 2013. Urban speeds had also dropped, from 56.5km/h in 1996 to 51.7km/h in 2013.
The lower threshold for speeding over holiday periods compared to normal times had resulted in a 36 per cent reduction in those speeding up to 10km/h above the limit and a 45 per cent reduction above 10km/h.