The way it works is the road has been “tuned” to a certain speed a car must go, and also some have been based on a certain car’s wheelbase and tires to give it that almost perfect tune and sound. It seems to be a hit for kids, but the people living close to the road seem to not care for it too much. They must not like the same song being played day after day when they come home from work. I wouldn’t like it either if I had to listen to a poor humm of “The William Tell Overture” everyday after a long day at work.
I think that they should implement more of these though, maybe on two lane roads where people can choose not to drive on the musical path. Some of the roads have been complained about so much that they are being paved over.
The only thing that scares me is what happens when you want to rewind or listen to it be played faster?