The cars work with a combination of computers, sensors and cameras. The cars do still require humans to drive in certain conditions and in certain circumstances, but by and large they take over the task of driving the car. As time goes on and the technology is refined, the cars may well become completely driverless.
Think about the effects of this: car accidents should become a rarity, car accident injury should all but disappear, car accident insurance should almost disappear, the need for police monitoring of the roads would be curtailed, taxi cabs should also become driverless eliminating that job, truck driving and transport drivers will no longer be needed in the same numbers, hospitals and injury treatment providers would not be needed in the same numbers, courts would note a reduction in the number of cases, and yes, personal injury lawyers specializing in car accident injury lawsuit cases would have to focus on other areas of law.
This new technology has the very real potential to change our society for the better. Given how central the car is to our society, it is difficult to think of anything that will have a greater impact on our society.