Japanese musical road

Japanese inventors have a created a road that can 'play music' as you drive along it. The Melody Road will allow a car passing above it to play a simple tune, which is made audible by ridges on the road's surface. The pitch of the note created is increased by increasing the frequency of the ridges, and the opposite is also true. The optimum driving speed for hearing the music is 28mph.

The optimum speed for the best sound reproduction is a shockingly slow 28 mph. At that speed, a little noise will be needed to keep the driver/passengers alive awake. In that respect, this is a fantastic measure against excessively slow drivers—who wants this crazy whirring going on whilst they are driving? The Melody Road has been incorporated in three locations throughout Japan, including Hokkaido, Wakayama and Gunma.