Comfort and Convenience
A multifunction steering wheel matters while travelling: audio and computer functions sit under the thumbs, so the hands stay on the rim and the eyes forward instead of reaching across to the console.
Safety and Driver Assistance
A passenger airbag only deploys once a collision is already happening, and it works with the belt rather than replacing it. Following distance is what gives the braking room to avoid that impact entirely.
Multimedia and Connectivity
A USB connection carries data as well as current, so a connected phone or memory stick can feed tracks to the audio system directly, with track selection handled through the car's own controls.