"...he realised that with some planning and time to kill he could create rows of grooves which, when driven over at a certain speed, would ‘play a tune...the results, the ‘melody road’, can be seen above and the grooves are between 6 and 12mm apart: the narrower the interval, the higher the pitch. these stretches of road, each playing a different tune, can currently be found in 3 places in japan..." You can only hear the tune at certain speeds. Is this a way to promote going the speedlimit? from deputydog 
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