Nearly every highway adds special ridges on the side of the road to warn drivers that they are dangerously close to the edge of the asphalt. National Geographic learned that a group of engineers were inspired to make musical rumble strips.
Nearly every highway adds special ridges on the side of the road to warn drivers that they are dangerously close to the edge of the asphalt. National Geographic learned that a group of engineers were inspired to make musical rumble strips.
