Todays Captured Thought: completely voice-activated cars

What if you were able to drive your car by just using your voice? Like, think about this, you can already talk to your car and have it do certain things with the radio and such, but what if you could tell it the speed by using your voice? So literally all you need to do is talk. You see the speed limit is 40, you just have to say "Car, go 40mph" and it does just that. It would have a built in GPS and then all you have to do is tell it where to go and it will bring you there. people will be able to get their licenses way earlier because all you have to know is how to talk. The car, by using the built in GPS, will be able to calculate the approximity of every turn and every destination, it will know the fastest routes to get you places, and if everyone were able to get one, car accidents would dramatically decrease because I know there is already a device that prevents cars from hitting others automatically, so why wouldn't this car have that? The possibilities are endless, which makes me wonder... with technology growing at the rate it is now, where will we be in 10, 15 or 20 years? This world can literally change in the blink of an eye and we've all seen it happen. think of the difference 1990-2000 made. Computers, little cell phones, voice activated cars?! Maybe this will be next, then again, we never really know.