Mercedes now have automatic braking and acceleration assist, night vision augmented reality, and maps with directions can be sent from your computer directly to your on-board navigation system.
I also saw an ad on Hulu for cars that have a "dashboard-watchdog system" that checks to make sure you are awake and alert for long, night-time drives. This same ad had steering correction for when you drift over the line. Coupled with the auto braking and acceleration... this could lead to self-driving cars.
I predict within 5 years that you will be able to send directions to your car, get in, and then have your car drive you wherever you want to go automatically... with little or no further input necessary for the "driver"... as long as your destination is on Google maps.