You know those rumble strips that're sorta stamped into paved roads? The ones that go vrump, vrump when you drive over them. That noise is characteristic, isn't it? Immediately recognizable. Which is good for safety, I think. They can instantly alert you if you start to drift out of your lane, for example. Or give useful cues to an upcoming intersection. Not a bad idea.
That noise, however. It isn't exactly melodic, is it? Have you ever wondered what other sounds rumble strips might be able to make? Perhaps something more pleasant? Well, wonder no more. There's a short section of old Route 66 near Albuquerque NM that answers the question.
The sound is kinda weak so you may have to max out your volume, and squint your ear balls, to hear it. My ABQ friends said National Geographic just did this project a few years ago. It may be one of very few in the country. I'll leave that research as homework (for either of my followers) to learn "the rest of the story" as Paul Harvey used to say.
