Hmmm... found this on Gizmodo
"Denny says this effort includes the deployment at about 100 intersections of high tech decals that create a 3-D image, to make drivers think there's something in the intersection:
"Plastic material that is laid down, and it gives the illusion of being a hump in the roadway. And therefore people react to it as though it were a hump, and slow down. The driver sees this in the roadway, and they think that its some protrusion up out of the roadway, and not a perfectly flat surface. So they slow down before they drive over it.""
They're easier/cheaper to install/remove than regular speed bumps, but you lose the actual "bump", defeating the purpose. It will work the first time, but after that?
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