citizen’s protest ????

[pault]

Sneak up on a mobile radar van. pinch a number plate.
Fix the plate to another vehicle and proceed past the radar unit at a decent speed. One may not hear of a result, but questions would surely be asked.

[Brock]

Its been done

[Kev Murphy]

Just an Urban Legend, circa 2003 ...Has been reported as happening in Dunedin, Canberra, and London.

"Four youths from..."

Though the camera thinks not but merely snaps, those who send out the tickets do indeed examine what they're mailing.

Still makes a good yarn, tho'

[HunterTodd]

I did my bit for the cause.  I went past a mobile camera car several times which was clearly trying to obscure itself.  I pulled up next to it one day and took a picture. The response of the driver was to take a picture of me taking a picture of him. Happy snaps all round.  I sent it to my local member with a letter of complaint which appeared to work because i never saw the car in that position again. 

[Kev Murphy]

Around 1992, a mobile camera was in the habit of parking on the side of the road under trees around 28 km east of Portland. Myself and two friends on bikes stopped at a pile of trash a bit further up the road, and we collected two largish cardboard boxes which we inscribed with a texta pen in large letters "SPEED CAMERA AHEAD!"
We placed these boxes, filled with rocks, at the side of the highway about a km around the bends both in front and behind the camera location. Must have made a slow day for the operator. 

[Yorkie]

As Brock said, it was done in Perth a couple of years ago, media had a ball with it.

[Kev Murphy]

Probably inspired by the internet yarn ...