Why is my Audi A3 making a strange noise at high speeds?

I've noticed that my Audi A3 makes a loud humming noise when I drive at speeds above 60 mph. It doesn't seem to affect the performance of the car, but it's quite annoying. What could be causing this and how can I fix it?

This could be due to worn out wheel bearings. Have a mechanic check and replace them if necessary.

It could also be caused by uneven tire wear. Consider getting your tires rotated and aligned to see if that helps.