We all know the drill. You see a speed camera, you slow down, you look at the camera, you check your speedometer and look for the camera again. But in the UK at least, reports now indicate that nearly half of the 1,000 speed cameras installed are entirely inactive.

Because many of the cameras installed in the UK during the 1990s failed to meet transportation department criteria for deployment, some 40% were immediately decommissioned. However, the boxes that house them are still there, even though many of them are empty altogether. Motorist groups are lobbying to have the inactive devices removed, citing them as a dangerous roadside distraction, but the government insists that whether they're in use or not, the visible presence of the camera boxes keep drivers' speeds in check.

[Source: The Daily Mail, Photo by SHAUN CURRY/AFP/Getty]