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.
"It's using big-brother tactics to balance the state budget," she said. "It's outlandish."
That's certainly been the reaction in Arizona, where the cameras have incited a mini revolt.