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... The video, taken on a highway, shows a car passing the truck in the left lane. Attached to its rear bumper is a large LED screen, which is powered on and cycling through a series of images. While it is difficult to make out the details in the video, they appear to be ads.

"This has to be illegal right? I don't think you can have any light sources facing backward on the road," said a commenter.

Sadly, while it might be illegal, it is just one more example of how electronic ads are creeping into more and more aspects of our daily lives. They are turning up at gas pumps, on urinals, and sometimes on moving vehicles.

Besides being just plain obnoxious, these ads lead to multiple problems. They can encourage overspending and waste as well as, in the case of those on the road, lead to distracted driving.

"Sorry officer I was reading the ad," said one commenter, putting a humorous spin on a grim possibility. ...