Tesla has posted another demo video that shows what an autonomous EV sees as it navigates local roads. As the clip illustrates, the cameras and sensors have to detect many, many different objects at any given moment: road lines, signs, lights, pedestrians and cars are among the many examples. The car even captures the "motion flow" of the environment to get a sense of where it's going.
This isn't a flawless test run. You see the vehicle slow down unnecessarily for people running by the roadside (about 1:30 in), for example. It's also uncertain how well this sort of demo would work in less than favorable conditions, such as snowy weather or nighttime drives on poorly-lit roads. However, it's still impressive. The car is sufficiently aware of its environment that the driver doesn't have to touch the wheel once, even in relatively complex situations.