A masked man, a citizens group, a judge and other motorists are behind the fight against photo enforcement.

Quote from the article:

Reporting from Phoenix - Arizonans drive long distances on their highways, and they like to do it fast. But since the Grand Canyon State began enforcing speed limits with roadside cameras, motorists are raging against the machines: They have blocked out the lenses with Post-it notes or Silly String. During the Christmas holidays, they covered the cameras with boxes, complete with wrapping paper. One dissenting citizen went after a camera with a pick ax. Arizona is the only state to implement "photo enforcement," as it's known, on major highways and is one of 12 states and 52 communities, plus the District of Columbia, with speed cameras, according to the nonprofit Insurance Institute for Highway Safety. The cameras, paired with radar devices, photograph vehicles exceeding the speed limit by 11 mph or more. A notice of violation -- carrying a fine of $181.50 -- is then sent to the address of the vehicle's registered owner.

Source: Arizona speed cameras incite a mini revolt