What's interesting is to learn what conditions it won't handle.
When there are poor or no lane markers, especially when there's no double yellow in a two-lane, two-way local highway. Or when construction's shifted the lanes away from their original positions and the old lane markers haven't been erased so cleanly. Or when there are periodic potholes the size of half-basketballs in the most-used tire lanes (tire lanes being the path your car's tires take). Or when the lane is both narrow with inches to spare on either side, and shifts suddenly, and there's a H2 up ahead in the other lane going at half the speed limit. Or when a 45MPH highway has a sudden 20MPH curve, and the lanes are narrow to boot.
This kind of autonomous driving may work when both road and weather conditions are ideal, but something a little smarter would be necessary for even slightly harsher situations. In the extreme case, a lot of driving under extremely limited visibility is basically a high-stakes game of follow the leader. Essentially, it's not enough to be able to perceive the environment; driving under those conditions requires perceiving the actions of other like actors (and relying on the assumption that those actors are sane).