The musical road is a road where a song is heard when you drive over it. Cutting some grooves in the asphalt, at a certain distance, can produce sounds when the car's wheels pass over them. Another variation of constructing these roads is the elevated marking, just as the demarcation lanes on the side of the highways are built.
The first musical road called "Asphaltophone" was created in 1995 in Denmark by 2 artists. There are many such roads in the world with different songs, below are just a few examples.
Denmark
Japan
New Mexico
Hungary
California
You can hear the music only if you reduce the speed ... smart way to keep the roads safe, right?