The modern car interface can do everything from making a dinner reservation to reading your text messages. In order to do this, an array of knobs and buttons are needed on the dashboard making the use of the system much more confusing. Sam Grobart, the Times’ personal technology editor, shows us three different interface systems that are trying to solve this problem. He test drives the Acura ZDX, Ford Focus, and the Audi A8 and finds that making our lives easier can often be frustrating.