Voice control totally sucks in most cars right now, including Teslas. I'd imagine the reason why its dangerous is because people get frustrated with it and have

Voice control totally sucks in most cars right now, including Teslas. I'd imagine the reason why its dangerous is because people get frustrated with it and have to start poking around at controls/touch screens to correct whatever commands it misinterpreted. But I can't imagine any reason why, in the future, a good natural voice interface (Siri level or better) would require any more "mental effort" than having a conversation with someone in your passenger seat. (The studies you link are referring to the distractions of in-car entertainment systems in general, not specifically the voice interface. The problem is really that drivers are taking their eyes off the road for extended periods to operate the touch screen, which wouldn't be necessary if the voice interface was capable enough)