The effort to make car travel more entertaining and productive, but not perilously distracting, has the auto industry walking a tightrope. Here are five technologies automakers have developed and already integrated into cars. Click through and see if you can guess which ones NHTSA has come down on. - Gabe Nelson
In most cars with Internet functionality, Web browsing is blocked from the moment the driver shifts out of park. Not in a Tesla. The electric-car company opted to keep Web browsing enabled while the Model S sedan is moving. After all, a front-seat passenger might want to use its expansive 17-inch touch screen, say, to search for a movie theater close to the nearest charging station while the driver stays focused on the road.