In Hokkaido they are constructing ‘melody roads’Â or roads that have specially constructed grooves so that it makes a recognizable melody when driven over.
The Hokkaido Industrial Research Institute started this a while back. Grooves are carved into the road between 6 and 12mm apart. The closer the grooves are, the higher pitched the sound. Apparently, the plan is to carve melodies into the roads that have some significance to the locality.
Click here to hear a sound clip of one of Hokkaido’s Road Melodies.