The “Singing” Highway in South Korea

Driving down the highway in South Korea can be a musical experience (just enough to get your attention, in case you’re sleepy or not paying attention): 

The road is carved into thousands of grooves. When the car tire hits the grooves, the vibrations turn into a sound source. It makes different tunes depending on the size of the grooves … The rhythm is controlled by the lengh of the groove. For example to get one second of the "do" note, the groove is stretched 28 meters.