One simple user interface (UI) feature that Honda has built into its car audio system has increased its ease of use and thus made it safer: the instant-on shortcut for powering up the radio. It's a very simple shortcut that allows the user to skip having to hit the POWER ON button to get started listening to the radio. The POWER ON button is still there, and I actually used it for years before realizing the shortcut existed in my Honda Fit. For comparison, I tested a 2012 Audi to see if the shortcut also exists in that car's stereo interface; it does not.

Noteworthy is how the architecture for the navigation changes when the shortcut is introduced. No longer do we have the POWER ON button being the supreme ruler over the other functions; rather, it has to share the leadership with roll with the AM/FM shortcut function. (see Diagram, below)

Honda Audio Navigation Hierarchy

Honda Audio Navigation's Shortcut is Makes the User Inputs More Democratic