Here is an interesting fact of acoustics:
If you take a trip to California, in the city of Lancaster, you will find a very special road. The road on Avenue G between 30th and 40th Street is dotted with grooves at precise distances from each other. When a car drives over these grooves at a speed of 88km/h (55mph), the occupants of the car will hear musical notes reminiscent of the finale of the overture to William Tell’s opera. The principle is the same as a highway curb which becomes noisy to warn drivers when it is engaged. By spacing the grooves precisely, different notes can be recognized and a melody can be created.