"The fact that some of these cameras are still issuing thousands of tickets shows the current approach isn't succeeding and speeds are not being managed."
Mr Noon says the proposal is not to help drivers avoid tickets - it is to get them to slow and check their speed, especially in high-risk areas.
Signs that alert drivers to speed cameras are used in Australia, the United Kingdom and other countries which New Zealand shares road-safety measures with, he says.
Last week, Police Minister Judith Collins said warning signs made motorists slow down only temporarily.
The AA said it supported the use of mobile cameras without signs and that if people chose to speed up again, they could be caught by cameras in police vans or by officers on patrol.
Speed cameras were signposted when they were first introduced in New Zealand in 1993.
But the warnings were removed in 2004 as part of a police road-safety campaign which warned that speeding drivers could be caught "anywhere, anytime".
Last year, police gave out 627,948 tickets for speeding infringements. This compared to 329,838 the previous year.
In the first four months of this year, the country's 55 cameras photographed 200,671 incidents of speeding.