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A Japanese engineer by the name of Shizuo Shinoda was digging with a bulldozer when he accidentally scraped some markings into a road with its claw. Later when he drove over the markings he realized that the vibration produced in his car can be heard as a tune. In 2007, a team of engineers from the Hokkaido Industrial Research Institute refined Shinoda's designs and built a number of “melody roads” in Japan. These roads have groves cut at very specific intervals along the road surface. Depending on how far apart the grooves are and how deep they are, a car moving over them will produce a series of high or low notes, enabling designers to create a distinct tune. The closer the grooves are, the higher the pitch of the sound. The critical ingredient in the mix is the speed of the car.

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The Civic Musical Road in Lancaster, California. Photo credit: roadtrippers.com

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