Audi's A7 Sportback is set to travel 550 miles from Silicon Valley to Las Vegas for CES 2015 with minimal human interference.
The prototype driverless car will require some piloting when it enters urban areas, but is otherwise fully autonomous in real world traffic and road conditions.
The car is capable of accelerating and braking independently, and can even change lanes and overtake other vehicles.
However, the driver must intervene if the A7 Sportback's speed exceeds 70 mph. The car will prompt its occupant when assistance is needed and will come to a full stop with hazard lights activated if they fail to respond.
The A7 uses an array of radar sensors to maintain a 360-degree view of its surroundings, but this technology is still in the concept phase.