The long-arm of the law now has the vision to match its reach, with WA Police deploying their new long-range camera over the Queens Birthday weekend as new penalties come into effect.

The new camera can detect drivers speeding, not wearing a seatbelt and using their mobile phone from up to 700 metres away, and in a two hour stint on the Great Eastern Highway last Thursday, Police Commissioner Karl O'Callahan said it proved its worth.

Tough new penalties come in from tonight for dangerous acts on the road.

In just two hours, the camera detected six speeding drivers, seven drivers not using their seatbelt, eight illegal U-turns and helped catch out one man driving without a license.

The new camera is being deployed as WA motorists face double demerits and tough new penalties for commiting dangerous acts on the road from midnight on Thursday.