Cat’s Eye: Reflective Road Marker

Cat’s Eye: Reflective Road Marker

"The Cat’s Eye invented in 1933 features reflective glass spheres set inside a rubber and cast-iron housing. Each unit is complex and dynamic, its various materials engineered to serve a variety of clever functions.

The metal part of the housing protects the device while creating an audible sound when a car passes over, like Botts’ Dots. Meanwhile, a fixed rubber wiper clears off the glass when it is pushed under the road. The Cat’s Eye is also retroflective, meaning: it redirects light back toward its source with minimum scattering, optimizing visibility for cars in motion."

article source
https://99percentinvisible.org/article/decoding-cats-eyes-global-color-guide-reflective-road-markers/

image source
https://upload.wikimedia.org/wikipedia/commons/3/33/Farmhillblvd.jpg

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