The Melody Road — Road That Plays Music!
You may or may not notice that on expressways in Singapore if you get too close to the edge you will get a whirring sound as a warning. This is due to special grooves etched on the road that resonate sounds into a car when its wheels travel over them. In Japan, they have taken this a step further and made one that actually plays a tune!
Instead of setting the grooves at equal distances to create a single frequency, the grooves on these special melody roads are spaced variably according to the tune of a song. To hear the tune properly, a car has to travel along the road at a specific speed, in this case at 40km/h. They can be found at three places throughout Japan — Hokkaido, Wakayama and Gunma.
Check out the video and listen to the tune of the Melody Road after the jump.