The locations of the new cameras that detect drivers using their mobile phones won't be secret - they just won't be signposted.
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The cameras are due to be rolled out from December and are expected to appear in the Illawarra - though it is unknown whether those cameras will be fixed or mobile.
While fixed and mobile speed cameras are required by law to have warning signs alerting drivers to their presence, the same rules will not apply for mobile phone detection cameras.
The cameras will not be specifically signposted at their location but general signage indicating mobile phone offences are being targeted will be placed across the state.
"It is important that we reinforce the message to all drivers that they could be caught anywhere, anytime if they take the risk of illegally using their mobile phone while driving," said Centre for Road Safety Executive Director Bernard Carlon.
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"Wherever a driver is on the network - the message is simple - get your hand off it."
However, motorists with an internet connection can find out where the detection cameras are - they will be published on the Centre for Road Safety website.
The program will be expanded over the next three years to reach a target of 135 million vehicle checks a year by 2022-23.
The camera locations will be selected using a range of criteria, including crash history and types of crashes, evidence of illegal mobile phone use, advice from NSW Police, and/or locations difficult to enforce using existing NSW Police resources.