Question from another thread:
"Those images make the map look like it will be really really small on a 7" screen. Same with video, why is everything so small?"
Because a 7" screen is about 3.5" x 6". In a car it's probably 2x to 3x as far from your eyes as the screen of a desktop computer that the developer created it on. So it's equal to less than 2" x 3" on a computer screen.
That's why I think it's important to eliminate clutter from the screen. When the image goes edge to edge it will 'feel' bigger than it is. Eliminate borders and go all the way to the edge when you can.
And it's a good idea to only put controls on the screen that are really necessary. (If the input isn't through a touchscreen, why reserve ANY screen space for controls?) Controls that will be used while driving are few -- volume mute/unmute and switch function, for example. Depending on what function is shown, change magnification of a map, switch tracks/stations, Play/Pause.