Why Do Some Roads Hum When You Drive Over Them? | RapidSmartFacts

On some highways, the pavement makes a steady hum under your tires. It almost sounds

like the road has its own note. What’s causing that sound?

The sound comes from vibrations in your tires and car body. When the tread

bumps over tiny ridges or grooves at regular spacing, it vibrates in a repeating pattern.

Those repeated bumps are like plucking a string at the same rhythm. At highway speeds,

that vibration falls into the range your ears hear as a hum. Some textured surfaces,

like tined concrete, are designed for drainage and grip. But they also create that sound.

Rumble strips at the road edge are even more extreme. Their deep grooves