Unless the AI has state and a model of the world (including a model of mind of the other drivers) it won't be able to anticipate dangers. It's going to be as bad as any teenager who has just mastered the controls but nothing else. Such a person is perfectly capable of keeping a straight lane on the highway (note - that's what today's driver assist systems are good for) but nothing else. You wouldn't want to be near them in traffic (doesn't everyone keep double distance from jerky drivers with L plates?) and you wouldn't trust them in dense traffic.
You can see that at the point where the Tesla busts through the stop sign - any normal person would associate a stop sign with danger and proceed with caution, except of course the teenager with L plates.
Current AI is better than a drunk teenager, but that's too low a bar. Driving sober, well-rested and in daytime (driving during the day also keeps you away from all the other drunkards) is actually remarkable safe. Remember that the safest mode of travel per journey is not the airplane, it's the motorcoach.