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Flashing traffic signs | |||||||||||||||||
Those little plastic gadgets for kids have images that seem to change when you change the angle of observation because the alternate images are made up of lines that can be seen through fine cylindrical lenses which make up the face of the image. If reflective traffic signs were made the same way, a bright image could alternate with a black non-reflective image to create a flashing sign as the car approached the sign and thereby shined its light on the sign in a slightly different angle.
sand, Dec 22 2003
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Would this be too distracting? There are other things on the road to look at. Also, some folk feel sick when things like this happen.
US Patent # 4420221 is just such a device. The manufacturer claimed it would replace battery operated barricade flashers and eliminate the need to relace batterys. I have one behind my desk. Why behind my desk? Because they don't work.No one pays attention to them.
The reason no one pays attention to it is probably that no one walks by your desk while the room is dark while shining a bright light on it. Automobile headlights shining on the sign in the dark might be a bit more attention getting.
Just to reitterate, Sand, the device you seek has already been invented and marketed. At least ten years ago. The reason you don't see them in circulation is they don't work.
The reason I keep one behind my desk is to remind myself that for every bad idea an engineer dreams up there is someone in marketing clever enough to unload them on someone.