Music is best heard at 45 km / hour

At last, bored Japanese drivers have a new way to amuse themselves. Engineers from Hokkaido have installed roads with grooves at varying intervals.  It produces a series of "notes" as cars drive over these grooves. You can read more about it in the Guardian here.

I can't really complain, the Japanese have made everything more fun. From trying to get a better mileage through the meter of my parent's Honda insight, to trying to control the speed we drive. What games will they come up with next?