This is an Android prototype application aiming to encourage a driver to respect speed limits, by reducing music volume when exceeding speed limit. It uses GPS and data connection.
A related app is Speed of sound, without speed limits awareness.
The application requires at least Android Kitkat (4.4, API 19).
- The app is not on the Play Store, so first you'll need to authorize unknown sources
- Download and execute on the phone the Android package (APK)
Warning: the app is very volume-related intrusive (foreground and background), you'll need to kill it to restore normal music volume use.