If you miss one of these vehicles, frankly you shouldn't be driving.

That's the advice from the NSW Roads Minister Duncan Gay who has announced measures to draw attention to mobile speed cameras, including new high-visibility livery for the vehicles.

The NSW Roads Minister Duncan Gay announces new high visibility paint jobs for mobile speed camera vehicles and new signs to warn motorists they are about to be checked. Credit:Anne Davies

"One of the things when we took government was to indicate to people we weren't about entrapment. We are about putting a proper road safety message out, and making sure people adhere to the speed cameras without being tricky," he said

Mobile speed cameras now have warning signs at 250 metres on approach and again at 50 metres. A third sign indicates that the car's speed has been checked.