A new program aimed at getting drivers in Philadelphia to heed the speed limit involving the use of 3-D images that will look like bumps in the road. The program is called "Drive CarePhilly," and the goal, according to Charles Denny, the city's chief traffic engineer, is simple.

 
"The goal is to change the mindset. The goal is to get the drivers to be less aggressive.  We want them to go what the speed limit is, not to assume that its a recommended speed, to know that its a speed limit that's appropriate on residential streets."

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."