Japan's Musical Road
Engineers in Japan were able to make music from one of their roads by virtue of vehicle tires rolling over different sets of grooves. The m...

https://www.bikernewsonline.com/2007/11/japans-musical-road.htm
The musical notes you see on the road are simply warnings that just up ahead you'll start to hear music from your tires. The music is made from a series of grooves cut perpendicular to the road. Different pitches are created by cutting the gooves closer or further apart.
The result is a cacophony of tires humming. Apparently, 28mph is the ideal speed to hear for a musical interlude.
InventorSpot.com has a video where you can hear it in action...
http://inventorspot.com/articles/melody_road
This 'musical road' idea, like many others, was copied by Japan from the good ol' USA - with a slight difference. Stateside, they ran trials of a hard-shoulder 'rumble strip'with different pitch grooves to make music from tyre hum - same concept, but pitched for the 50mph speed limit. The tune selected was "Nearer, my God, to thee"...........
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